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Journal articles on the topic 'Uredinii'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Hacquard, Stéphane, Christine Delaruelle, Valérie Legué, et al. "Laser Capture Microdissection of Uredinia Formed by Melampsora larici-populina Revealed a Transcriptional Switch Between Biotrophy and Sporulation." Molecular Plant-Microbe Interactions® 23, no. 10 (2010): 1275–86. http://dx.doi.org/10.1094/mpmi-05-10-0111.

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The foliar rust caused by the basidiomycete Melampsora larici-populina is the main disease affecting poplar plantations in Europe. The biotrophic status of rust fungi is a major limitation to study gene expression of cell or tissue types during host infection. At the uredinial stage, infected poplar leaves contain distinct rust tissues such as haustoria, infection hyphae, and uredinia with sporogenous hyphae and newly formed asexual urediniospores. Laser capture microdissection (LCM) was used to isolate three areas corresponding to uredinia and subjacent zones in the host mesophyll for express

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2

Lehman, Jeffrey S., and Gregory Shaner. "Selection of Populations of Puccinia recondita f. sp. tritici for Shortened Latent Period on a Partially Resistant Wheat Cultivar." Phytopathology® 87, no. 2 (1997): 170–76. http://dx.doi.org/10.1094/phyto.1997.87.2.170.

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Wild-type fungal population 851-WT was selected for shortened latent period on cv. CI 13227 for five uredinial generations to study the adaptation of Puccinia recondita f. sp. tritici to partially resistant wheat cultivars. Differences among wild-type and selected populations for traits contributing to parasitic fitness (i.e., latent period, infection frequency, and uredinium area and growth rate) were assessed in monocyclic infection experiments on susceptible cv. Monon and partially resistant cvs. Suwon 85, Sw 72469-6, L-574-1, and CI 13227. Differences were greatest among fungal populations

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3

Lehman, Jeffrey S., Karin A. Hanson, and Gregory Shaner. "Relationship Among Genes Conferring Partial Resistance to Leaf Rust (Puccinia triticina) in Wheat Lines CI 13227 and L-574-1." Phytopathology® 95, no. 2 (2005): 198–205. http://dx.doi.org/10.1094/phyto-95-0198.

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This study describes the segregation of genes for resistance to the fungus Puccinia triticina in a cross between partially resistant wheat lines L-574-1 and CI 13227 with two and four genes for resistance, respectively. The objectives of this study were to use parental, F1, F2, and backcross populations to quantify maternal effects, degree of dominance, and transgressive segregation, and to determine whether CI 13227 and L-574-1 share any resistance genes for long latent period or small uredinia. In two experiments conducted in the greenhouse, the uppermost leaf of adult wheat plants was inocu

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4

van der Kamp, B. J. "Production of uredinia and telia by stalactiform blister rust in British Columbia." Canadian Journal of Botany 71, no. 3 (1993): 519–21. http://dx.doi.org/10.1139/b93-057.

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Records of uredinia and telia production on the alternate hosts of Cronartium coleosporioides in British Columbia and inoculation of Castilleja miniata with aeciospores collected from various locations showed that rust isolates from dry areas of the interior of British Columbia do not produce uredinia and may have lost the ability to do so. Collections from somewhat wetter areas produced uredinia or mixtures of uredinia and telia immediately following aeciospore inoculations, and field collections from such areas in June commonly had mixtures of uredinia and telia. Loss of the uredinial stage

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5

Cheon, W., Y. S. Kim, S. G. Lee, and Y. H. Jeon. "First Report of Cane and Leaf Rust on Rubus fruticosus Caused by Kuehneola uredinis in Korea." Plant Disease 97, no. 8 (2013): 1115. http://dx.doi.org/10.1094/pdis-12-12-1138-pdn.

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In September 2011, we observed a rust disease affecting about 90% of the leaves of several Rubus fruticosus L. plants at Andong (36°32′12.4″ N, 128°47′20.1″ E), Korea. Pustule formation occurred on cane surfaces and on the undersurfaces of leaves, with yellowing, reddening, and necrosis on the corresponding upper leaf surface. Leaf distortion and senescence also occurred. For light and scanning electron microscopy, uredinia were detached from leaf lesions using a razor blade and then mounted in water without staining. Leaves with lesions were prepared by gold sputtering and then observed by SE

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6

Newcombe, G. "Association of Mmd1, a Major Gene for Resistance to Melampsora medusae f. sp. deltoidae, with Quantitative Traits in Poplar Rust." Phytopathology® 88, no. 2 (1998): 114–21. http://dx.doi.org/10.1094/phyto.1998.88.2.114.

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A single gene, Mmd1, which conditions resistance and a necrotic flecking response to a monouredinial isolate of Melampsora medusae f. sp. deltoidae and is presumed to possess the corresponding avirulence gene, was previously shown to segregate 3:1 (resistant to susceptible) in an interspecific hybrid poplar F2 progeny. Some inoculated clones of the resistant phenotypic class of this progeny were completely resistant and bore no uredinia, but most bore some sporulating uredinia with accompanying necrotic flecking. The dominant allele at the Mmd1 locus in these incompletely resistant clones was

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7

Porto, Lis Natali Rodrigues, and Alfredo Seiiti Urashima. "Development of a single uredinium inoculation method for Puccinia kuehnii, the causal agent of sugarcane orange rust." Summa Phytopathologica 44, no. 4 (2018): 311–16. http://dx.doi.org/10.1590/0100-5405/181427.

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ABSTRACT The use of resistant varieties is the ideal method to control rusts. Nevertheless, knowing the pathogen’s diversity is fundamental to the success of this measure. Diversity can be analyzed phenotypically and/or genotypically. For phenotypic diversity, the reaction of genotypes is assessed by means of inoculations of the pathogen generally obtained from several uredinia. One handicap of this technique is its impossibility to detect diversity among these uredinia, assuming that they are all homogenous. Therefore, the aim of the present study was to develop a single uredinium technique f

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8

Lynch, T. N., J. J. Marois, D. L. Wright, et al. "First Report of Soybean Rust Caused by Phakopsora pachyrhizi on Phaseolus spp. in the United States." Plant Disease 90, no. 7 (2006): 970. http://dx.doi.org/10.1094/pd-90-0970c.

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Phakopsora pachyrhizi Syd. & P. Syd., the cause of soybean rust, was first observed in the continental United States in November 2004 (2). During the growing season of 2005, P. pachyrhizi was confirmed on soybean (Glycine max) and/or kudzu (Pueraria montana) in nine states in the southern United States. It is known that P. pachyrhizi has a much larger host range within the Fabaceae family. On 29 September 2005 in Quincy, FL, 45 entries of mostly large-seeded legumes were planted next to soybeans that were infected with P. pachyrhizi. Several seeds of each entry were planted on one hill. So

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9

Díaz-Lago, J. E., D. D. Stuthman, and K. J. Leonard. "Evaluation of Components of Partial Resistance to Oat Crown Rust Using Digital Image Analysis." Plant Disease 87, no. 6 (2003): 667–74. http://dx.doi.org/10.1094/pdis.2003.87.6.667.

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Digital image analysis is an objective and nondestructive method potentially capable of providing accurate and precise estimates of disease resistance components. This study was conducted to quantify components of partial resistance to crown rust through the analysis of sequential digital images of inoculated leaves of adult oat plants, and to compare components found in two sources of resistance unrelated genetically. Uredinium density, relative infection frequency, latent period, days to first pustule appearance, uredinium size, and disease progress rates were assessed on three oat lines (RS

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10

Bonde, M. R., S. E. Nester, W. F. Moore, and T. W. Allen. "Comparative Susceptibility of Kudzu Accessions from the Southeastern United States to Infection by Phakopsora pachyrhizi." Plant Disease 93, no. 6 (2009): 593–98. http://dx.doi.org/10.1094/pdis-93-6-0593.

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Soybean rust, caused by Phakopsora pachyrhizi, was first discovered in the continental United States in the fall of 2004. The potential for economic loss in the United States hinges largely on whether or not the pathogen can survive winters in the absence of soybean. Kudzu (Pueraria lobata) is known to be a host for P. pachyrhizi in Asia and South America and is widely distributed in the southern United States. This study examined reactions of kudzu collected from several areas of the southeastern United States to three isolates of P. pachyrhizi, one each from Alabama, Louisiana, and Brazil. S

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11

Koike, S. T., and R. H. Molinar. "Rust Disease on Lemongrass in California." Plant Disease 83, no. 3 (1999): 304. http://dx.doi.org/10.1094/pdis.1999.83.3.304d.

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Lemongrass (Cymbopogon citratus) is a minor crop grown for its edible stem and oil. The plant is grown both commercially, by specialty producers, and noncommercially, particularly by homeowners of various Asian communities. For several years, a rust disease has affected the lemongrass plantings in coastal and inland California. Symptoms consist of elongated, stripelike, dark brown lesions that develop on both sides of leaf surfaces. Only lesions on abaxial leaf surfaces erupt and develop dark cinnamon brown uredinial pustules. Lesion development can be substantial, and coalescing lesions resul

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12

Johnson, Dennis A. "Slow-Rusting Resistance in Native Spearmint to Puccinia menthae." Plant Disease 98, no. 1 (2014): 62–66. http://dx.doi.org/10.1094/pdis-04-13-0353-re.

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Rust, caused by Puccinia menthae, is often a serious yield-reducing problem on native and Scotch spearmint in south-central Washington State. Rust resistant mint cultivars would reduce a dependence on fungicides for disease management; however, conventional breeding practices are not possible because commercial mint plants are sterile. Mutant Scotch and native spearmint lines induced by irradiation were evaluated for partial resistance to rust. Latent period and number of uredinia per leaf from urediniospore inoculations in the greenhouse and aecial and uredinial development in the field were

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13

Pfister, S. E., S. Halik, and D. R. Bergdahl. "Effect of Temperature on Thekopsora minima Urediniospores and Uredinia." Plant Disease 88, no. 4 (2004): 359–62. http://dx.doi.org/10.1094/pdis.2004.88.4.359.

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Thekopsora minima is a heteroecious rust, with spermogonia and aecia occurring on the needles of hemlock (Tsuga spp.) and uredinia, telia, and basidia occurring on the leaves of ericaceous genera, including species of Rhododendron. The effect of temperature was determined for urediniospore germination, germ tube growth, and infection efficiency on Rhododendron ‘White Lights’. Percent germination and germ tube growth were assessed at 10, 15, 20, 25, and 30°C after 3 h of incubation on 1.5% water agar in the dark. Polynomial regression analyses revealed a significant effect of temperature on bot

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14

Kolmer, J. A. "First Report of a Wheat Leaf Rust (Puccinia triticina) Phenotype with High Virulence to Durum Wheat in the Great Plains Region of the United States." Plant Disease 99, no. 1 (2015): 156. http://dx.doi.org/10.1094/pdis-06-14-0667-pdn.

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Phenotypes of the wheat leaf rust pathogen Puccinia triticina with high virulence to tetraploid durum wheat (Triticum turgidum) are found regularly in Mexico (5), the Mediterranean region (1), the Middle East (3), and rarely in the Imperial Valley of California and the adjacent area in Arizona. Previous to 2013, these phenotypes had not been found in the Great Plains region of the United States where hexaploid, T. aestivum types of hard red winter wheat, hard red spring wheat, and durum wheat are grown. In May 2013, collections of P. triticina, the wheat leaf rust fungus identified by color, s

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15

Rebollar-Alviter, A., A. M. Minnis, L. J. Dixon, et al. "First Report of Leaf Rust of Blueberry Caused by Thekopsora minima in Mexico." Plant Disease 95, no. 6 (2011): 772. http://dx.doi.org/10.1094/pdis-12-10-0885.

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Blueberry (Vaccinium corymbosum L.) is becoming an important crop in the states of Jalisco and Michoacan in Mexico. Leaf rust, a disease causing extensive defoliation on plants with severe infections, was observed in the autumn of 2007 and it has become one of the most significant diseases of blueberry in these states. Symptoms on the upper surfaces of leaves appear as small, yellow spots that later turn necrotic as they enlarge and coalesce and eventually cover large areas of individual leaves. On the undersides of leaves, small flecks surrounded by small water-soaked halos appear, turn yello

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16

Tunali, B., A. Yildirim, M. C. Aime, and J. R. Hernández. "First Report of Rust Disease Caused by Uromyces galegae on Galega officinalis in Turkey." Plant Disease 90, no. 4 (2006): 525. http://dx.doi.org/10.1094/pd-90-0525b.

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Galega officinalis L. is an obnoxious invasive weed in the United States and a potential target for biological control efforts. The plant, a member of the legume family, is native to western Asia and southern Europe. During September 2001, uredinial pustules were observed on leaves of G. officinalis L. in Kizilcahamam, Ankara. Specimens were examined microscopically and compared with published descriptions (2) and herbarium specimens in the U.S. National Fungus Collections, Beltsville, MD. The fungus was subsequently identified as Uromyces galegae (Opiz) Sacc. on the basis of morphological cha

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17

Hartman, G. L., R. A. Hines, C. D. Faulkner, T. N. Lynch, and N. Pataky. "Late Season Occurrence of Soybean Rust Caused by Phakopsora pachyrhizi on Soybean in Illinois." Plant Disease 91, no. 4 (2007): 466. http://dx.doi.org/10.1094/pdis-91-4-0466b.

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Soybean rust, first reported in the continental United States in Louisiana in 2004 (2), is one of the most important foliar diseases of soybean worldwide. On 10 October 2006, 20 soybean leaflets from 20 plants at physiological maturity were arbitrarily collected in research plots near Glendale, IL at the University of Illinois Dixon Springs Agricultural Center in Pope County and sent by overnight courier. On 11 October, leaflets were examined with a dissecting microscope at the Soybean Disease Laboratory at the National Soybean Research Center, and then at the Plant Disease Clinic, University

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18

Avazov, S. "Mildew of onion in the Tashkent Region." Bulletin of Science and Practice, no. 12 (December 12, 2017): 141–44. https://doi.org/10.5281/zenodo.1112369.

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In this article presents data on the study mildew of onions in the Tashkent Region. 8 species from 3 genera of 2 families of rust fungi were identified, 5 of which were not previously reported by researchers in Uzbekistan. Urediynia and the fetus are noted in 3 species: Uromyces ambiguns, Puccinia allii, P. porri, and eucalyptus and spermogonia in 5 species: Melampsora allii–fragalis, M. alli–populina, M. allii salicis–albae, Puccinia permixta and P. winteriana. Most often, Puccinia allii and P. porri were the species that caused rust onions in crops. Analyzing the seasonal d

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19

Pelayo-Sánchez, Gabriela, María de Jesús Yáñez-Morales, Roney Solano-Vidal, et al. "Hemileia vastatrix in Coffea spp.: Distribution of Urediniospores Grouped by Size and Insights into Morphological Structures." Journal of Fungi 11, no. 2 (2025): 109. https://doi.org/10.3390/jof11020109.

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Hemileia vastatrix coffee leaf rust reduces Mexican coffee production by 51%. We aimed to analyze the size and distribution of H. vastatrix urediniospores among coffee plantations, as well as the morphological structures of the uredinium. In 2015, 65 leaf samples with rust symptoms were collected from 17 coffee cultivars grown at various altitudes (229–1649 m) under different environmental conditions in 14 regions of four Mexican states. A total of 30 spores per sample were measured and grouped using the Ward centroid method, and the group distribution was analyzed. Uredinia morphology was exa

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20

Berndt, Reinhard. "Chrysomyxa rust: morphology and ultrastructure of D-haustoria, uredinia, and telia." Canadian Journal of Botany 77, no. 10 (2000): 1469–84. http://dx.doi.org/10.1139/b99-113.

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An electron- and light-microscopic study revealed that D-haustoria of Chrysomyxa rhododendri (DC.) De Bary and Chrysomyxa pirolata Winter were pedicellate and had a more or less tuber-shaped haustorial body. The haustorial necks were wrapped by a fold of the extrahaustorial membrane (velopedunculate haustorial type). The aecioid uredinia of Chrysomyxa rhododendri and Chrysomyxa empetri (Pers.) Schröter were covered by a one-layered peridium of the pucciniastreous type. In Chrysomyxa pirolata, young uredinia were covered by one to three layers of sterile fungal cells. In all investigated specie

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21

van Jaarsveld, L. C., W. M. Kriel, and A. Minnaar. "First Report of Puccinia thaliae on Canna Lily in South Africa." Plant Disease 90, no. 1 (2006): 113. http://dx.doi.org/10.1094/pd-90-0113c.

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Canna indica L., known as Indian shot or canna lily, occurs throughout the New World in tropical and subtropical areas. This upright, perennial, rhizomatous herb is a popular garden plant in South Africa because of its spectacular plant habit and growth vigor. During January 2005, canna lily leaves with rust symptoms were collected from Pietermaritzburg in the province of KwaZulu-Natal. Orange-yellow uredinia were observed primarily on the abaxial surfaces, often covering the entire leaf with coalescing pustules. Koch's postulates were completed in repeated tests with spray inoculations of blo

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22

Ciszewska-Marciniak, Joanna, Małgorzata Jędryczka, Stanisław Jeżowski, Jerzy Przyborowski, Katarzyna Wojciechowicz, and Elżbieta Zenkteler. "Morphology of uredinia and urediniospores of the fungus Melampsora larici-epitea Kleb. a damaging pathogen of common osier (Salix viminalis L.) in Poland." Acta Agrobotanica 63, no. 2 (2012): 117–25. http://dx.doi.org/10.5586/aa.2010.039.

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Rust (<i>Melampsora</i> spp.) is a damaging disease of willows (<i>Salix</i> spp.), including common osier (<i>S. viminalis</i> L.). So far, the pathogens of this species found in Europe were identified as <i>M. larici-epitea</i> Kleb. or <i>M. ribesii-viminalis</i> Kleb. Moreover, a stem infecting form (SIF), deprived of a sexual stage in its life cycle was reported. The aim of this study was to find out which species of the rust fungi cause disease symptoms on common osier in Poland. The isolates from common osier were compared to t

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23

Pioli, R. N., M. V. Cambursano, and E. N. Morandi. "Morphologic and Pathometric Characterization of the Asian Soybean Rust (Phakopsora pachyrhizi) in Santa Fe Province, Argentina." Plant Disease 89, no. 6 (2005): 684. http://dx.doi.org/10.1094/pd-89-0684b.

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The Asian soybean rust caused by the fungus Phakopsora pachyrhizi was cited for the first time in Argentina during the 2002-2003 growing season (3). During 2003-2004, the disease spread to other northern provinces and was also observed in north-central Santa Fe, the main producing soybean province of the country. Because the disease appeared at the end of the crop growing season (late March to early April) it had little or no impact on crop yields. The objectives of this study were to characterize morphologically and pathometrically the disease on soybean and check the presence of P. pachyrhiz

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24

Harding, M. W., J. C. Stutz, and R. W. Roberson. "Host-parasite relationships in bean cultivars of varying susceptibility to bean rust." Canadian Journal of Botany 77, no. 11 (2000): 1551–59. http://dx.doi.org/10.1139/b99-104.

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Components of disease development were measured in three cultivars of Phaseolus vulgaris L. (common bean) infected with Uromyces appendiculatus (Pers.:Pers.) Unger (bean rust fungus) race O. Disease measurements and light and electron microscope data of host-parasite relationships were obtained and analyzed. Uredinial size, infection efficiency, latent period, and fungal colony radius were measured from infected bean leaves that were grown under controlled conditions. Phaseolus vulgaris cultivar Pinto 111, a highly susceptible check, displayed the largest uredinia, the highest infection effici

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25

Twizeyimana, M., P. S. Ojiambo, K. Sonder, T. Ikotun, G. L. Hartman, and R. Bandyopadhyay. "Pathogenic Variation of Phakopsora pachyrhizi Infecting Soybean in Nigeria." Phytopathology® 99, no. 4 (2009): 353–61. http://dx.doi.org/10.1094/phyto-99-4-0353.

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Soybean rust, caused by Phakopsora pachyrhizi, is an important disease in Nigeria and many other soybean-producing countries worldwide. To determine the geographical distribution of soybean rust in Nigeria, soybean fields were surveyed in the Derived Savanna (DS), Northern Guinea Savanna (NGS), and Southern Guinea Savanna (SGS) agroecological zones in Nigeria between 2004 and 2006. Disease severity in each zone was determined and analyzed using geostatistics. Prevalence of infected fields and disease severity in surveyed fields were significantly (P < 0.05) different between geographical zo

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26

Beckett, A., and A. M. Woods. "The pattern of colony development and the formation of the uredinium of Uromyces viciae-fabae on Vicia faba." Canadian Journal of Botany 65, no. 10 (1987): 1998–2006. http://dx.doi.org/10.1139/b87-273.

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Low-temperature scanning electron microscopy of frozen-hydrated specimens and transmission electron microscopy of cytochemically stained thin sections and enzymically digested samples have been used to study the pattern of colony development from the initial infection in the substomatal chamber of the leaf to the production of urediniospores within uredinia. Rapid immobilization of leaf samples by freezing enables them to be fractured, revealing information on internal structural relationships between intercellular hyphae and host cells. Extracellular matrix substances, which are well preserve

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Twizeyimana, M., P. S. Ojiambo, R. Bandyopadhyay, and G. L. Hartman. "Use of Quantitative Traits to Assess Aggressiveness of Phakopsora pachyrhizi Isolates from Nigeria and the United States." Plant Disease 98, no. 9 (2014): 1261–66. http://dx.doi.org/10.1094/pdis-12-13-1247-re.

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Soybean rust, caused by Phakopsora pachyrhizi, is one of the most important foliar diseases of soybean worldwide. The soybean–P. pachyrhizi interaction is often complex due to genetic variability in host and pathogen genotypes. In a compatible reaction, soybean genotypes produce tan-colored lesions, whereas in an incompatible reaction soybean genotypes produce an immune response (complete resistance) or reddish-brown lesions (incomplete resistance). In this study, in total, 116 and 72 isolates of P. pachyrhizi from Nigeria and the United States, respectively, were compared based on six quantit

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Bonde, M. R., S. E. Nester, D. K. Berner, R. D. Frederick, W. F. Moore, and S. Little. "Comparative Susceptibilities of Legume Species to Infection by Phakopsora pachyrhizi." Plant Disease 92, no. 1 (2008): 30–36. http://dx.doi.org/10.1094/pdis-92-1-0030.

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Knowledge of the host range of Phakopsora pachyrhizi is important to agriculture in the United States because of the distinct possibility that economic losses could occur to crops other than soybean. Furthermore, it is possible that alternative hosts could provide a means of overwintering of the pathogen, providing inoculum to initiate epidemics in future years. To clarify the potential importance of soybean rust on nonsoybean legumes and their role in overwintering of the disease, multiple accessions of clover, cowpea, pea, kudzu, lima bean, snap bean, and single accessions of coffee senna, F

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Markell, S., T. Gulya, K. McKay, et al. "Widespread Occurrence of the Aecial Stage of Sunflower Rust Caused by Puccinia helianthi in North Dakota and Minnesota in 2008." Plant Disease 93, no. 6 (2009): 668. http://dx.doi.org/10.1094/pdis-93-6-0668c.

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Sunflower rust caused by Puccinia helianthi (Schw.) is widespread in North America and occurs annually on cultivated sunflower (Helianthus annuus L.) and wild annual and perennial Helianthus spp., although severity on the U.S. sunflower crop has been increasing in recent years (2). P. helianthi is a autoecious, macrocyclic rust, but the aecial stage is rarely observed in the field (1,3,4). In most years, the earliest appearance of sunflower rust in North Dakota (ND) and surrounding states usually occurs in early August as the uredinial stage. Initial inoculum can result from urediniospores tha

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Su, D., J. F. Fu, R. J. Zhou, and X. R. Yan. "Severe Outbreak of Rust Caused by Coleosporium pulsatillae Detected on Pulsatilla spp. in China." Plant Disease 96, no. 5 (2012): 768. http://dx.doi.org/10.1094/pdis-12-11-1078-pdn.

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Windflower (Pulsatilla spp.) is a perennial medicinal plant in the Ranunculaceae with high economic value as well as medicinal value in China. It is a commonly used Chinese herbal medicine. In 2007, two species, Pulsatilla koreana Nakai and P. chinensis Regel, were observed with severe rust symptoms at three locations (Shenyang City, Benxi City, and Fushun County) in Liaoning, China. The diseased area was estimated to be more than 500 ha and the yield was reduced by 30% on average with up to 65% yield losses in some fields. Since its first record in 2007, the disease has been recorded every ye

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Moricca, Salvatore, Alessandra Benigno, Claudia Maria Oliveira Longa, Santa Olga Cacciola, and Giorgio Maresi. "First Documentation of Life Cycle Completion of the Alien Rust Pathogen Melampsoridium hiratsukanum in the Eastern Alps Proves Its Successful Establishment in This Mountain Range." Journal of Fungi 7, no. 8 (2021): 617. http://dx.doi.org/10.3390/jof7080617.

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Melampsoridium hiratsukanum is an alien rust fungus which has spread pervasively throughout several European countries following introduction into North Europe at the end of the 20th century. The authenticity of several records of the Melampsoridium species infecting alder (Alnus spp.) in the northern hemisphere is questionable, due to the misidentification and confusion that surround many of the older reports. Given this complicated taxonomic history, and since a M. hiratsukanum-like rust is strongly impacting Alnus incana stands in the Alps, probably affecting the bank protection role of thi

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Ward, N. A., C. L. Robertson, A. K. Chanda, and R. W. Schneider. "Effects of Simplicillium lanosoniveum on Phakopsora pachyrhizi, the Soybean Rust Pathogen, and Its Use as a Biological Control Agent." Phytopathology® 102, no. 8 (2012): 749–60. http://dx.doi.org/10.1094/phyto-01-11-0031.

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The fungus Simplicillium lanosoniveum was isolated from soybean leaves infected with Phakopsora pachyrhizi, the soybean rust pathogen, in Louisiana and Florida. The fungus did not grow or become established on leaf surfaces until uredinia erupted, but when soybean rust signs and symptoms were evident, S. lanosoniveum colonized leaves within 3 days and sporulated within 4 days. Development of new uredinia was suppressed by about fourfold when S. lanosoniveum colonized uredinia. In the presence of S. lanosoniveum, uredinia became increasingly red-brown, and urediniospores turned brown and germin

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Kaur, R., A. R. McTaggart, D. M. Ferrin, and M. C. Aime. "First Report of Uromyces plumbarius, Rust of Gaura, in Louisiana and a new host, Guara lindheimeri." Plant Disease 96, no. 4 (2012): 590. http://dx.doi.org/10.1094/pdis-12-11-1020.

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Gaura lindheimeri Engelm. & A. Gray (Onagraceae) is an ornamental shrub that is native to southern Louisiana and Texas. Its texture and form make it a popular perennial border plant. In April 2010 and 2011, three collections of Guara leaf samples with signs and symptoms of a rust disease were made from a home garden in Baton Rouge, LA. Infected leaves showed chlorotic lesions on the adaxial surface and were associated with scattered, hypophyllous uredinia. Urediniospores were globose to obovoid, echinulate, had two equatorial germ pores, and measured 16 to 21 × 18 to 25 μm with a wall 2 μm

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Dufault, N. S., S. A. Isard, J. J. Marois, and D. L. Wright. "Removal of Wet Deposited Phakopsora pachyrhizi Urediniospores from Soybean Leaves by Subsequent Rainfall." Plant Disease 94, no. 11 (2010): 1336–40. http://dx.doi.org/10.1094/pdis-01-10-0068.

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Urediniospores of Phakopsora pachyrhizi, the soybean rust fungus, have a high probability of being removed from a soybean leaf by water runoff associated with subsequent rainfall after wet deposition. The effects of rainfall intensity, subsequent spore-free rainfall duration, and soybean leaf sample height on uredinia density were used to evaluate the retention of urediniospores on soybean leaf tissue. Rainfall simulations of 45 and 85 mm/h were conducted on potted soybean plants that were inoculated with 2 min of urediniospore-injected simulated rainfall and exposed to 0, 1, and 30 min of sub

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35

Demers, J. E., J. M. McKemy, B. Bushe, et al. "First Report of Rust Caused by Pucciniastrum boehmeriae on Māmaki (Pipturus albidus) in Hawaii." Plant Disease 98, no. 6 (2014): 855. http://dx.doi.org/10.1094/pdis-11-13-1172-pdn.

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Pipturus albidus (Hook. & Arn.) A. Gray or māmaki is a flowering plant species in the Urticaceae (nettles) endemic to the Hawaiian Islands. Māmaki is a forest and agricultural commodity, as well as a traditional medicinal and fiber crop. In August 2013, leaf rust was observed in Kuristown, Hawaii, on 15 māmaki plants. Infected leaves had vein-delimited chlorotic spots on the adaxial surface and yellow to orange uredinia on the abaxial surface. Uredinia were scattered, minute, pulverulent, subepidermal, and dome-shaped with a central pore, consistent with Pucciniastrum. Urediniospores were

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36

Carmona, M. A., C. Fortugno, and P. L. Achával. "Morphologic and Pathometric Characterization of the Asian Soybean Rust (Phakopsora pachyrhizi) on Kudzu (Pueraria lobata) in Argentina." Plant Disease 89, no. 10 (2005): 1132. http://dx.doi.org/10.1094/pd-89-1132b.

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Asian soybean rust (ASR) is a very important disease caused by Phakopsora pachyrhizi. The disease has emerged as a major threat to soybean production in South America since 2001. During the 2003-2004 growing season, P. pachyrhizi spread rapidly throughout most soybean-growing areas of northwestern and northeastern Argentina (1). One widespread naturalized host in the northeastern part of the country is kudzu (Pueraria lobata). Plants of severely infected kudzu were sampled during January 2005 in Cerro Azul (29°29′S Misiones Province) to quantify P. pachyrhizi infection and morphologically char

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Pate, M. C., J. K. Pataky, W. C. Houghton, and R. H. Teyker. "First Report of Puccinia sorghi Virulent on Sweet Corn with the Rp1-D Gene in Florida and Texas." Plant Disease 84, no. 10 (2000): 1154. http://dx.doi.org/10.1094/pdis.2000.84.10.1154a.

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For the past 15 years, the Rp1-D gene has controlled common rust on sweet corn in North America. In August and September 1999, isolates of Puccinia sorghi were collected from Rp1-D sweet corn hybrids in Illinois, Wisconsin, Minnesota, Michigan, and New York. This was the first widespread occurrence in the continental United States of P. sorghi virulent on the Rp1-D gene (1). Isolates of P. sorghi collected from Los Mochis, Mexico, in March 2000 had a pattern of virulence similar to the pattern for the isolates collected in the Midwest in 1999 (2). In April and May 2000, small uredinia were obs

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Bonde, M. R., S. E. Nester, C. N. Austin, et al. "Evaluation of Virulence of Phakopsora pachyrhizi and P. meibomiae Isolates." Plant Disease 90, no. 6 (2006): 708–16. http://dx.doi.org/10.1094/pd-90-0708.

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Asian soybean rust (ASR), caused by Phakopsora pachyrhizi and recently discovered for the first time in continental United States, has been of concern to the U.S. agricultural industry for more than 30 years. Since little soybean rust resistance is known, and resistance is often difficult to detect or quantitate, we initiated a project to develop a better, more quantitative, method. The methodology determined the average numbers and diameters of uredinia in lesions that developed on leaves of inoculated plants 14 days after inoculation. It was used to compare virulence of P. pachyrhizi isolate

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BATRA, L. R. "Attraction of Twospotted Spider Mite to Bean Rust Uredinia." Plant Disease 78, no. 3 (1994): 282. http://dx.doi.org/10.1094/pd-78-0282.

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Pataky, J. K., and W. F. Tracy. "Widespread Occurrence of Common Rust, Caused by Puccinia sorghi, on Rp-Resistant Sweet Corn in the Midwestern United States." Plant Disease 83, no. 12 (1999): 1177. http://dx.doi.org/10.1094/pdis.1999.83.12.1177d.

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Single, dominant resistance genes have been used successfully for the past 15 years to control common rust, caused by Puccinia sorghi, on sweet corn in the United States. Most sweet corn hybrids grown in the Midwest for mid- to late-season processing have Rp resistance, which is expressed as hypersensitive reactions resulting in chlorotic or necrotic flecks with little or no formation of urediniospores. Many, but not all, Rp-resistant sweet corn hybrids carry the gene Rp1D. Biotypes of P. sorghi in North America have been avirulent on plants with the Rp1D gene, except for an isolate collected

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Harmon, C. L., P. F. Harmon, T. A. Mueller, J. J. Marois, and G. L. Hartman. "First Report of Phakopsora pachyrhizi Telia on Kudzu in the United States." Plant Disease 90, no. 3 (2006): 380. http://dx.doi.org/10.1094/pd-90-0380c.

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Soybean rust caused by Phakopsora pachyrhizi H. Sydow & Sydow was first reported in the continental United States during 2004 (2). By 10 November 2005, the disease was confirmed in eight southern states (Florida, Georgia, Alabama, Mississippi, South Carolina, North Carolina, Louisiana, and Texas). Diagnoses have been based on visual observation of uredinia and urediniospores of the pathogen followed by polymerase chain reaction confirmation. On 10 November 2005, uredinia and telia were identified on leaves of kudzu (Pueraria lobata) in central Florida. Telia first were noted as dark brown-

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Wood, A. R., and M. Scholler. "Puccinia abrupta var. partheniicola on Parthenium hysterophorus in Southern Africa." Plant Disease 86, no. 3 (2002): 327. http://dx.doi.org/10.1094/pdis.2002.86.3.327a.

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Parthenium weed (Parthenium hysterophorus L., family Asteraceae), an annual herb of neotropic origin, is an invasive noxious weed with a pantropical distribution (1). It is particularly undesirable because of the serious health risks it poses to people living close to infestations (1). In January 1995, S. Neser (ARC-Plant Protection Research Institute, Pretoria, South Africa) collected a rust fungus on this plant near Brits, Northwest Province, South Africa (25°35′S, 27°46′E). Only uredinia were present. The same rust fungus was collected in the same area in January, March, and June of 2001, a

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Crane, Patricia E., and Yasuyuki Hiratsuka. "Evidence for environmental determination of uredinia and telia production in Chrysomyxa pirolata (inland spruce cone rust)." Canadian Journal of Botany 78, no. 5 (2000): 660–67. http://dx.doi.org/10.1139/b00-041.

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Chrysomyxa pirolata Wint., the cause of inland spruce cone rust, is a serious pathogen in natural spruce forests and seed orchards. Cone infection is caused by basidiospores produced by telia on alternate hosts in the genera Pyrola, Moneses, and Orthilia. The disease cycle of this rust and the influence of moisture on the differentiation of telia on Pyrola asarifolia Michx. were studied over two growing seasons at a wet site adjacent to a spruce seed orchard and a drier site adjacent to another orchard at Smoky Lake, Alberta, and at Edmonton and Hinton, Alberta. The proportion of uredinia to t

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WANG, LI-LI, KE-MEI LI, YUN LIU, and CHENG-MING TIAN. "Melampsora salicis-michelsonii sp. nov. on Salix michelsonii and Melampsora salicis-cavaleriei on Salix serrulatifolia from China." Phytotaxa 435, no. 4 (2020): 280–92. http://dx.doi.org/10.11646/phytotaxa.435.4.2.

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Based on morphological and phylogenetic analyses, two Melampsora species on willows collected in China were identified and described. One species, Melampsora salicis-michelsonii sp. nov. on Salix michelsonii, is characterized by uredinia amphigenous to mainly hypophyllous; urediniospores globoid to ellipsoid, echinulate; paraphyses capitate, clavate, intermixed, sometimes thickened at apex; telia amphigenous to mainly epiphyllous, and teliospores subepidermal with evenly thickened wall. Phylogenetically, the new species forms a new monophyletic clade with high support values 93/0.99 (ML/BI). A

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Guazina, Renato Anastácio, Rosiane Araujo Rodrigues Nass, Gustavo De Faria Theodoro, Ricardo Carneiro Brumatti, Sofia Michele Muchalak, and Henrique De Oliveira Golin. "Agronomic and Economic Evaluation of Sequential Spray of Silicon and Fungicides for a Sustainable Soybean Crop." Journal of Agricultural Studies 8, no. 2 (2020): 1. http://dx.doi.org/10.5296/jas.v8i2.15676.

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This study was carried out to determine whether the yield of soybean cultivars and the severity of Asian Soybean Rust (ASR) are influenced by foliar spray of silicon exclusively or along with a fungicide mixture, as well as the economic viability of their use for a sustainable crop. The experiment was performed in randomized-block design, five replicates, two soybean cultivars and (2×6) + 2 factorial arrangements: S1 (AlSi at R1 + R4); S2 (AlSi at R1 + R5.1); S3 (AlSi at R1 + FM at R4); S4 (FM at R1 + AlSi at R4); S5 (AlSi at R1 + FM at R5.1); S6 (FM at R1 + AlSi at R5.1); NC and PC (negative

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Chen, W., and T. C. Harrington. "Genetic diversity of poplar leaf rust populations in the north-central United States." Canadian Journal of Forest Research 36, no. 8 (2006): 2047–57. http://dx.doi.org/10.1139/x06-099.

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Uredinia of poplar leaf rust, Melampsora medusae Thüm f.sp. deltoides, appeared in late July 1998, June 1999, and August 2000 in a cottonwood (Populus deltoides Bartr.) stand in Ames, Iowa. Seedlings of the alternate host (eastern larch, Larix laricina (Du Roi) K. Koch) set out at the site in spring 2000 formed aecia 3 months before uredinia appeared. Using three PCR-based microsatellite markers, the aecial population was genetically diverse and in Hardy–Weinberg equilibrium, typical of a population that had gone through sexual reproduction. Uredinia populations in 1998–2000 had lower levels o

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Tunali, B., A. Yildirim, M. C. Aime, J. Hernández, and D. Berner. "First Report of the Rust Fungus Coleosporium tussilaginis on Tussilago farfara in Turkey." Plant Disease 89, no. 10 (2005): 1131. http://dx.doi.org/10.1094/pd-89-1131c.

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Tussilago farfara L. (“coltsfoot”, Asteraceae) is indigenous to Eurasia, including Turkey, but has been classified as a Class A noxious weed in North America. Plant pathogens are being sought as potential candidates for biological control of coltsfoot. A rust fungus, Coleosporium tussilaginis (Pers) Lev. has been reported to cause disease on T. farfara from Europe, Russia, and Japan (2). During August of 2001 and 2002, rust pustules were observed on coltsfoot leaves in Kizilcahamam, Ankara, Turkey. Diseased plant specimens with rust pustules were collected, examined microscopically, and compar

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Kulik, Martin M., and Pierre D. Dery. "The Uredinial State of Puccinia festucae-ovinae." Mycologia 85, no. 4 (1993): 711. http://dx.doi.org/10.2307/3760516.

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Zavodnik Lamovšek, Alma. "Prostorsko planiranje na poti k sistemski ureditvi." Urbani izziv 14, no. 1 (2003): 15–20. http://dx.doi.org/10.5379/urbani-izziv-2003-14-01-003.

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Kulik, Martin M., and Pierre D. Dery. "The Uredinial State of Puccinia Festucae-Ovinae." Mycologia 85, no. 4 (1993): 711–13. http://dx.doi.org/10.1080/00275514.1993.12026323.

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