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Journal articles on the topic 'Ramularia leaf spot'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Ascari, João Paulo, Inês Roeder Nogueira Mendes, Vanessa Costa da Silva, and Dejânia Vieira de Araújo. "Ramularia leaf spot severity and effects on cotton leaf area and yield1." Pesquisa Agropecuária Tropical 46, no. 4 (2016): 434–41. http://dx.doi.org/10.1590/1983-40632016v4642781.

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ABSTRACT Cotton monoculture favors the development of diseases such as ramularia leaf spot, which causes early defoliation and boll rotting, thus decreasing yield. This study aimed at evaluating the severity of ramularia leaf spot and its effects on cotton leaf area and yield. The experiment was conducted in a triple (4 x 3 x 2) factorial design, consisting of four cultivars (FM940GLT, FM944GL, TMG42WS and TMG43WS), three thirds of the plant (lower, middle and upper) and two management conditions (with and without fungicide application). To the variable area under the disease progress curve, t

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2

Dussart, Francois, and Dorota Jakubczyk. "Biosynthesis of Rubellins in Ramularia collo-cygni—Genetic Basis and Pathway Proposition." International Journal of Molecular Sciences 23, no. 7 (2022): 3475. http://dx.doi.org/10.3390/ijms23073475.

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The important disease Ramularia leaf spot of barley is caused by the fungus Ramularia collo-cygni. The disease causes yield and quality losses as a result of a decrease in photosynthesis efficiency due to the appearance of necrotic spots on the leaf surface. The development of these typical Ramularia leaf spot symptoms is thought to be linked with the release of phytotoxic secondary metabolites called rubellins in the host. However, to date, neither the biosynthetic pathways leading to the production of these metabolites nor their exact role in disease development are known. Using a combined i

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3

Mařík, P., Z. Šnejdar, and P. Matušinsky. "Expression of resistance to Ramularia leaf spot in winter barley cultivars grown in conditions of the Czech Republic." Czech Journal of Genetics and Plant Breeding 47, No. 1 (2011): 37–40. http://dx.doi.org/10.17221/34/2010-cjgpb.

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The fungus Ramularia collo-cygni is increasingly important as the causal agent of Ramularia leaf spot (RLS), a novel leaf spot disease of barley. The work aimed to identify gene resources suitable for developing new breeding lines of winter barley with improved resistance. During the first experimental period (2001&ndash;2005), RLS incidence was monitored in 711 cultivars and advanced breeding lines. Differences were detected in the intensity of symptomatic expression, but no material showed high resistance. During the second experimental period (2006&ndash;2009), response to natural R

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4

Jalli, Marja, Janne Kaseva, Björn Andersson, et al. "Yield increases due to fungicide control of leaf blotch diseases in wheat and barley as a basis for IPM decision-making in the Nordic-Baltic region." European Journal of Plant Pathology 158, no. 2 (2020): 315–33. http://dx.doi.org/10.1007/s10658-020-02075-w.

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Abstract Fungal plant diseases driven by weather factors are common in European wheat and barley crops. Among these, septoria tritici blotch (Zymoseptoria tritici), tan spot (Pyrenophora tritici-repentis), and stagonospora nodorum blotch (Parastagonospora nodorum) are common in the Nordic-Baltic region at variable incidence and severity both in spring and winter wheat fields. In spring barley, net blotch (Pyrenophora teres), scald (Rhynchosporium graminicola, syn. Rhynchosporium commune) and ramularia leaf spot (Ramularia collo-cygni) are common yield limiting foliar diseases. We analysed data

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5

Mäe, Andres, and Riinu Kiiker. "Challenges in Ramularia collo-cygni Control." Encyclopedia 2, no. 1 (2022): 256–63. http://dx.doi.org/10.3390/encyclopedia2010017.

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Ramularia leaf spot (RLS), caused by the fungus Ramularia collo-cygni, has recently become widespread in Europe. Succinate dehydrogenase inhibitor (SDHI) and demethylation inhibitor (DMI) fungicides are mainly applied for disease control on barley fields, but pathogen isolates with a reduced sensitivity can cause difficulties. There is an urgent need for new spring barley cultivars that are more resistant to RLS development and can inhibit R. collo-cygni epidemics.

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6

De Souza, Hugo Manoel, Alfredo Ricieri Dias, Gustavo De Faria Theodoro, Christian Rones Wruck de Souza Osório, and Fernando Fagner Magalhães. "Cultivar, Plant Height and Fungicide for Integrated Control of Ramularia Spot and Increased Cotton Yield." Journal of Agricultural Studies 8, no. 2 (2020): 224. http://dx.doi.org/10.5296/jas.v8i2.15871.

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Cotton is a crop with a high economic value, usually sprayed with large amounts of pesticides to control pests and diseases. Ramularia spot is a foliar disease that cause early defoliation and can compromise cotton yield; however, there is a need of information about the interaction of cultivars and plant height as a tool to improve ramularia control and increase yield. The objective of this study was to evaluate the effects of the interaction between plant height, cultivar, and fungicides applied to the severity of the leaf spot and cotton yield. The experiment was carried on during the 2014/

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7

Hostert, N. D., C. L. Blomquist, S. L. Thomas, D. G. Fogle, and R. M. Davis. "First Report of Ramularia carthami, Causal Agent of Ramularia Leaf Spot of Safflower, in California." Plant Disease 90, no. 9 (2006): 1260. http://dx.doi.org/10.1094/pd-90-1260c.

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Ramularia leaf spot was identified in several fields of safflower (Carthamus tinctorius) near Gridley, CA in June 2005. Numerous circular to irregularly shaped brown lesions, 3 to 10 mm in diameter, on both sides of leaves and flower bracts resulted in stunted plants and reduced seed production. In two of the fields, nearly all plants were affected, yields were severely reduced, and the crops were abandoned. Ramularia carthami Zaprom. was identified on the basis of morphology of reproductive structures on colonized leaves (1). Hyaline, thin-walled, aseptate conidiophores (2.6 to 4.3 × 28.8 to

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8

McGrann, GrahamR D., and NeilD Havis. "Ramularia Leaf Spot: A Newly Important Threat to Barley Production." Outlooks on Pest Management 28, no. 2 (2017): 65–69. http://dx.doi.org/10.1564/v28_apr_05.

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9

da Silva, Juliano Cesar, Wagner Bettiol, and Nelson Dias Suassuna. "Ramularia leaf spot: an emergent disease of cotton in Brazil." Tropical Plant Pathology 44, no. 6 (2019): 473–82. http://dx.doi.org/10.1007/s40858-019-00308-w.

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10

Havis, N. D., K. Gorniak, M. A. Carmona, A. N. Formento, A. G. Luque, and M. M. Scandiani. "First Molecular Detection of Ramularia Leaf Spot (Ramularia collo-cygni) in Seeds and Leaves of Barley in Argentina." Plant Disease 98, no. 2 (2014): 277. http://dx.doi.org/10.1094/pdis-04-13-0416-pdn.

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The fungus Ramularia collo-cygni B. Sutton & J. M. Waller (Rcc) was identified as the causal agent of this emerging disease on barley (Hordeum vulgare L.) based on symptoms and signs on leaves and attributes of the fungus. The common name given to the disease was “necrotic sprinkling.” This disease was found for the first time on barley in fields of Buenos Aires Province, Argentina, in 2001, with severities ranging from 60 to 100% (2). During the spring of 2012, the disease spread throughout most barley growing areas of the Pampean region, affecting almost all varieties of barley in the Bu

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11

Sjokvist, Elisabet, Rene Lemcke, Manoj Kamble, et al. "Dissection of Ramularia Leaf Spot Disease by Integrated Analysis of Barley and Ramularia collo-cygni Transcriptome Responses." Molecular Plant-Microbe Interactions® 32, no. 2 (2019): 176–93. http://dx.doi.org/10.1094/mpmi-05-18-0113-r.

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Ramularia leaf spot disease (RLS), caused by the ascomycete fungus Ramularia collo-cygni, has emerged as a major economic disease of barley. No substantial resistance has been identified, so far, among barley genotypes and, based on the epidemiology of the disease, a quantitative genetic determinacy of RLS has been suggested. The relative contributions of barley and R. collo-cygni genetics to disease infection and epidemiology are practically unknown. Here, we present an integrated genome-wide analysis of host and pathogen transcriptome landscapes identified in a sensitive barley cultivar foll

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12

Sooväli, P., M. Tikhonova, and P. Matušinsky. "First Report of Ramularia Leaf Spot Caused by Ramularia collo-cygni on Leaves and Seeds of Barley in Estonia." Plant Disease 98, no. 7 (2014): 997. http://dx.doi.org/10.1094/pdis-10-13-1035-pdn.

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Ramularia leaf spot (RLS) is a disease of barley (Hordeum vulgare) caused by the fungus Ramularia collo-cygni Sutton & Waller (Rcc). Rcc causes necrotic lesions, premature senescence of leaves, and yield reduction. Under Estonian conditions, there are usually no leaf spots on the upper leaves of barley prior to flowering. In 2009, 2010, and 2012, symptoms similar to those of RLS were observed on leaves of spring and winter barley in several Estonian agricultural regions. Approximately 30% of the plants in affected fields were symptomatic. Symptoms were not observed in 2011, which was a dry

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13

Thach, Tine, Lisa Munk, Anne Lisbet Hansen, and Lise N. Jørgensen. "Disease variation and chemical control of Ramularia leaf spot in sugar beet." Crop Protection 51 (September 2013): 68–76. http://dx.doi.org/10.1016/j.cropro.2013.04.010.

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14

Havis, Neil D., James K. M. Brown, Gladys Clemente, et al. "Ramularia collo-cygni—An Emerging Pathogen of Barley Crops." Phytopathology® 105, no. 7 (2015): 895–904. http://dx.doi.org/10.1094/phyto-11-14-0337-fi.

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Ramularia collo-cygni is the biotic factor responsible for the disease Ramularia leaf spot (RLS) of barley (Hordeum vulgare). Despite having been described over 100 years ago and being considered a minor disease in some countries, the fungus is attracting interest in the scientific community as a result of the increasing number of recorded economically damaging disease epidemics. New reports of disease spread and fungal identification using molecular diagnostics have helped redefine RLS as a global disease. This review describes recent developments in our understanding of the biology and epide

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15

ASCARI, JOÃO PAULO, DEJÂNIA VIEIRA DE ARAÚJO, LEONARDO DIOGO EHLE DIAS, GIOVANI JUNIOR BAGATINI, and INÊS ROEDER NOGUEIRA MENDES. "SEVERITY OF RAMULARIA LEAF SPOT AND SEED COTTON YIELD IN DIFFERENT SOWING TIMES." Revista Caatinga 29, no. 3 (2016): 603–10. http://dx.doi.org/10.1590/1983-21252016v29n310rc.

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ABSTRACT The ramularia leaf spot (RLS) disease causes cotton yield losses. Choosing a less susceptible cultivar and a sowing time that are less favorable to the pathogen contribute to the management of this disease. The objective of this work was to evaluate the severity of ramularia leaf spot on cotton cultivars sowed in two different times. The experiment was conducted in a triple factorial design (4x3x2), consisted of four cultivars, the three thirds of the plant and two sowing times, with four replications. Each plot was divided in two twin plots, one with fungicide application (with disea

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16

Shaw, Douglas V., Royce S. Bringhurst, and Victor Voth. "Quantitative Genetic Variation for Resistance to Leaf Spot (Ramularia tulasnei) in California Strawberries." Journal of the American Society for Horticultural Science 113, no. 3 (1988): 451–56. http://dx.doi.org/10.21273/jashs.113.3.451.

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Abstract Strawberry (Fragaria × ananassa Duch.) seedlings from biparental crosses were planted in two trials at Watsonville, Calif. Sept. 1985 and 1986. The 1985 trial was scored on three dates and the 1986 trial on four dates for leaf spot (Ramularia tulasnei) infection. Individual seedlings were assigned a value of 0 to 5 on each date, with 0 indicating no infection and 5 indicating very severe infection. Average infection scores were lowest for the earliest scoring dates in both years (0.93 and 0.38) and maximum at late scoring dates (2.83 and 1.49). Narrow-sense heritabilities for infectio

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17

Wu, C. L., B. C. Xiang, S. F. Zhao, and K. F. Guo. "Leaf Spot on Snow Lotus (Saussurea involucrata) Caused by Ramularia carthami in China." Plant Disease 100, no. 12 (2016): 2524. http://dx.doi.org/10.1094/pdis-03-16-0383-pdn.

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18

Kumar, A., and H. K. Joshif. "Development of leaf spot caused by Ramularia carthami and reaction of safflower cultivars." Journal of Agricultural Science 125, no. 2 (1995): 223–25. http://dx.doi.org/10.1017/s0021859600084343.

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SUMMARYSafflower (Carthamus tinctorius L.) is an important oilseed crop in India. A severe leaf spot disease caused by Ramularia carthami Zaprom. was observed in 1983 and investigations were carried out in order to analyse the role of environmental factors in disease development. High temperature and normal relative humidity, with dry rainless days, favoured disease development. Studies on the nature of in vivo resistance and susceptibility to R. carthami showed that growth of the fungal germ-tube was slower on resistant than on susceptible safflower cultivars, where the germ-tube extended wit

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19

McGrann, Graham R. D., Steven Miller, and Neil D. Havis. "The ENHANCED MAGNAPORTHE RESISTANCE 1 locus affects Ramularia leaf spot development in barley." European Journal of Plant Pathology 156, no. 1 (2019): 123–32. http://dx.doi.org/10.1007/s10658-019-01869-x.

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AbstractRamularia leaf spot (RLS) is a newly-important disease of barley which is caused when the fungus Ramularia collo-cygni enters necrotrophic development during colonisation of the host. Mutant alleles at the barley MILDEW LOCUS O, mlo, locus confer broad spectrum durable resistance against the powdery mildew fungus, Blumeria graminis f. sp. hordei, but can enhance susceptibility to pathogens with necrotrophic development stages such as R. collo-cygni. Given the importance of mlo in spring barley breeding programmes, identifying loci that mitigate the effect of mlo-mediated susceptibility

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20

GILIO, THIAGO ALEXANDRE SANTANA, DEJÂNIA VIEIRA DE ARAÚJO, WILLIAN KRAUSE, HUGO HENRIQUE RIBEIRO ROSA, and JOÃO PAULO ASCARI. "GENETIC DIVERGENCE AMONG COTTON GENOTYPES GROWN IN THE MAIN SEASON AND OFF SEASON." Revista Caatinga 30, no. 2 (2017): 377–90. http://dx.doi.org/10.1590/1983-21252017v30n213rc.

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ABSTRACT The objective of this work was to evaluate the agronomic performance and estimate the genetic divergence of 18 cotton genotypes grown in the main season (sowed in December, 2012) and off season (sowed in January, 2013), considering their agronomic characteristics and resistance to Ramularia leaf spot. A randomized block experimental design was used, with five replications. The characteristics evaluated were plant height, first branch height, position of first fruiting branch, height of first fruiting branch, length between nodes, number of nodes, average number of bolls per plant, ave

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21

Cheshkova, A. F. "Quantitative assessment of white spot (Ramularia tulasnei) disease severity of strawberry based on hyperspectral imaging." IOP Conference Series: Earth and Environmental Science 957, no. 1 (2022): 012005. http://dx.doi.org/10.1088/1755-1315/957/1/012005.

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Abstract This study examined strawberry white spot disease severity using different hyperspectral imaging analyzing methods. The plant leaf images were classified by spectral angle mapper (SAM), by vegetation indices (RENDVI, GNDVI, MCARI) thresholds and by principal component analysis (PCA) method. The SAM method showed the overall accuracy 84% when classifying three types of visual symptoms of the disease.

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22

Harvey, I. C. "Epidemiology and control of leaf and awn spot of barley caused by Ramularia collocygni." New Zealand Plant Protection 55 (August 1, 2002): 331–35. http://dx.doi.org/10.30843/nzpp.2002.55.3901.

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Leaf and awn spot of barley caused by the fungus Ramularia collocygni (Ovularia hordei) has been prevalent in crops in Canterbury New Zealand over the last few seasons causing rapid leaf senescence late in the season Control can readily be achieved with a single triazole and strobilurin fungicide application but timing of application at late booting is important A rate response to a triazole fungicide was noted but there was no response to the rates of the strobilurin fungicides tested Good control is achieved at both high and low application rates with strobilurins The correlation between dis

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23

TORMEN, NÉDIO RODRIGO, and LUIZ EDUARDO BASSAY BLUM. "Ramularia leaf spot effect on yield and fiber quality of cotton submitted to fungicide application." Revista Caatinga 32, no. 3 (2019): 634–46. http://dx.doi.org/10.1590/1983-21252019v32n308rc.

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ABSTRACT Ramularia leaf spot (RLS) is the major cotton disease in Brazil and one of the main causes of crop yield reduction. The disease causes defoliation reduces photosynthetic capacity and causes premature opening of bolls. Due to the impact of RLS on the production of Brazilian cotton and the lack of scientific publications investigating the disease, the present work aims to evaluate the efficiency of fungicides in controlling disease and their impact on yield and fiber quality. Three field experiments were carried out during the 2014/2015 and 2016/2017 seasons in Planaltina, Federal Distr

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24

Matušinsky, P., M. Hanusová, L. Stemberková, et al. "Response of spring barley cultivars to Ramularia leaf spot in conditions of the Czech Republic." Cereal Research Communications 41, no. 1 (2013): 126–32. http://dx.doi.org/10.1556/crc.2012.0023.

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25

JALLI, M., P. LAITINEN, and S. LATVALA. "The emergence of cereal fungal diseases and the incidence of leaf spot diseases in Finland." Agricultural and Food Science 20, no. 1 (2008): 62. http://dx.doi.org/10.2137/145960611795163015.

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Fungal plant pathogens causing cereal diseases in Finland have been studied by a literature survey, and a field survey of cereal leaf spot diseases conducted in 2009. Fifty-seven cereal fungal diseases have been identified in Finland. The first available references on different cereal fungal pathogens were published in 1868 and the most recent reports are on the emergence of Ramularia collo-cygni and Fusarium langsethiae in 2001. The incidence of cereal leaf spot diseases has increased during the last 40 years. Based on the field survey done in 2009 in Finland, Pyrenophora teres was present in

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Baltaduonytė, Milda, Zenonas Dabkevičius, Zita Brazienė, and Elena Survilienė. "Dynamics of spread and control of cercospora (Cercospora beticola Sacc.) and ramularia (Ramularia beticola Fautrey and F.Lamb.) leaf spot in sugar beet crops." Zemdirbyste-Agriculture 100, no. 4 (2013): 401–8. http://dx.doi.org/10.13080/z-a.2013.100.051.

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27

Palladino Almada, María Cintia. "Ramularia leaf spot management alternatives in barley optimizing the use of fungicides for its control: Doctoral thesis abstract." Agrociencia Uruguay 28, Suppl theses (2024): e1475. http://dx.doi.org/10.31285/agro.28.1475.

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Ramularia collo-cygni (Rcc) is the causal agent of Ramularia leaf spot (RLS). The main management tool is the use of foliar fungicides, the impact of which on cereal safety is unknown. Therefore, the aim of this thesis was to optimise the management of ramulariosis in barley and to minimise fungicide residues in grain. The specific objectives were: (i) to validate a method for the detection and quantification of Rcc in seeds and seedlings by real-time PCR (qPCR), (ii) to determine the importance of seeds as a source of in-crop Rcc inoculum in production systems in Uruguay, (iii) to develop a m

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28

Shi, Min, and Yan-Zhong Li. "Evaluation of the Growth, Sporulation, Fungicide Efficacy, and Host Range of Ramularia sphaeroidea." Microorganisms 12, no. 4 (2024): 766. http://dx.doi.org/10.3390/microorganisms12040766.

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Ramularia sphaeroidea was primarily identified based on the characteristics of its conidia and several sequences. The fungus causes severe leaf spot disease on hairy vetch (Vicia villosa var. glabrescens) in Yunnan Province in China. The growth, sporulation, fungicide efficacy, and host range of the pathogen were evaluated to aid in disease management. Different types of culture media and carbon and nitrogen sources were used to evaluate the growth of R. sphaeroidea. Oatmeal, maltose, and potassium nitrate agar had a higher amount of sporulation. Difenoconazole (10%) was the most effective fun

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29

McGrann, Graham R. D., and James K. M. Brown. "The role of reactive oxygen in the development of Ramularia leaf spot disease in barley seedlings." Annals of Botany 121, no. 3 (2017): 415–30. http://dx.doi.org/10.1093/aob/mcx170.

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30

Blomquist, C. L., and C. Y. Warfield. "First Report of Ramularia didyma Causing a Leaf Spot on Ranunculus (Ranunculus asiaticus) Hybrids in California." Plant Disease 95, no. 7 (2011): 872. http://dx.doi.org/10.1094/pdis-12-10-0892.

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Ranunculus or Persian buttercups (Ranunculus asiaticus) are colorful, cool-season perennials or annuals grown as landscape bedding plants and for field-grown bulb and cut flower production in mild winter climates. In March of 2008, tan-to-brown lesions were observed on the foliage of containerized ranunculus growing in a greenhouse at a production and retail nursery in coastal San Mateo County, CA. Approximately 15% of the approximately 150 cv. Bloomingdale mixed shade ranunculus plants had leaf spot symptoms. Symptomatic plants were generally clustered together on two benches, with a double-f

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Kaczmarek, M., M. J. Piotrowska, J. M. Fountaine, et al. "Infection strategy ofRamularia collo-cygniand development of ramularia leaf spot on barley and alternative graminaceous hosts." Plant Pathology 66, no. 1 (2016): 45–55. http://dx.doi.org/10.1111/ppa.12552.

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Palladino, Cintia, Carlos A. Pérez, Lucia Pareja, Andrés Pérez-Parada, Jorge Franco, and Silvia Pereyra. "Fungicide strategies for Ramularia Leaf Spot control recommended in Uruguay and its residues in barley grains." Agrociencia Uruguay 28 (February 1, 2024): e1262. http://dx.doi.org/10.31285/agro.28.1262.

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Ramularia leaf spot (RLS) is primarily managed by foliar fungicide spraying, which can result in residues in the grain. In recent years, increasing attention has been paid to the risks these residues pose to consumers. This study aimed to evaluate the efficacy of fungicide management used for RLS control and their fungicide residues in barley grain. Four different alternatives of fungicide mixtures: fluxapyroxad + pyraclostrobin + epoxiconazole; pyraclostrobin + epoxiconazole + chlorothalonil; prothioconazole + trifloxystrobin, and isopyrazam + azoxystrobin, in three spray timings: GS33, GS47

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Wu, Yue-Xuan, and Andreas von Tiedemann. "Evidence for Oxidative Stress Involved in Physiological Leaf Spot Formation in Winter and Spring Barley." Phytopathology® 92, no. 2 (2002): 145–55. http://dx.doi.org/10.1094/phyto.2002.92.2.145.

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A leaf spot disease with unknown etiology has become more pronounced in spring and winter barley in Germany in recent years. The symptoms are similar to net blotch and Ramularia leaf spots, but the causal agents of these diseases are not identified. The symptom expression varied much on cultivars. Cultivars most affected by the disease of both spring and winter barley showed a significantly higher level of superoxide (O2¯) production and lipid peroxidation (malondialdehyde), but a lower level of antioxidant potential expressed as superoxide dismutase (SOD) activity, catalase activity, and inte

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Schützendübel, A., M. Stadler, D. Wallner, and A. von Tiedemann. "A hypothesis on physiological alterations during plant ontogenesis governing susceptibility of winter barley to ramularia leaf spot." Plant Pathology 57, no. 3 (2008): 518–26. http://dx.doi.org/10.1111/j.1365-3059.2007.01820.x.

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35

da Silva, Juliano Cesar, Nelson Dias Suassuna, and Wagner Bettiol. "Management of Ramularia leaf spot on cotton using integrated control with genotypes, a fungicide and Trichoderma asperellum." Crop Protection 94 (April 2017): 28–32. http://dx.doi.org/10.1016/j.cropro.2016.12.006.

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36

Kiiker, Riinu, Marite Juurik, and Andres Mäe. "Fungicide Resistance Evolving in Ramularia collo-cygni Population in Estonia." Microorganisms 9, no. 7 (2021): 1514. http://dx.doi.org/10.3390/microorganisms9071514.

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Ramularia leaf spot caused by the fungus Ramularia collo-cygni, has recently become widespread in Estonian barley fields. Currently, disease control in barley fields relies on SDHI and DMI fungicides, which might be threatened by R. collo-cygni isolates that are well-adapted to fungicide pressure. In a two-year study, 353 R. collo-cygni isolates were collected from spring barley fields in Estonia. A total of 153 R. collo-cygni isolates were examined for sensitivity to azoles (DMIs; prothioconazole-desthio, epoxiconazole, mefentrifluconazole) and succinate dehydrogenase inhibitors (SDHIs; bosca

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37

Hoheneder, Felix, Katharina Hofer, Jennifer Groth, Markus Herz, Michael Heß, and Ralph Hückelhoven. "Ramularia leaf spot disease of barley is highly host genotype-dependent and suppressed by continuous drought stress in the field." Journal of Plant Diseases and Protection 128, no. 3 (2021): 749–67. http://dx.doi.org/10.1007/s41348-020-00420-z.

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AbstractSince the 1980s, Ramularia leaf spot (RLS) is an emerging barley disease worldwide. The control of RLS is increasingly aggravated by a recent decline in fungicide efficacy and a lack of RLS-resistant cultivars. Furthermore, climate change increases drought periods in Europe, enhances variable weather conditions, and thus will have an impact on severity of plant diseases. Hence, identification of RLS-resistant cultivars and understanding of disease progression under abiotic stress are important aims in integrated disease management under climate change. In the present study, we evaluate

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Koike, S. T., R. F. Smith, P. W. Crous, and J. Z. Groenewald. "Leaf and Stem Spot Caused by Ramularia sphaeroidea on Purple and Lana Woollypod Vetch (Vicia spp.) Cover Crops in California." Plant Disease 88, no. 2 (2004): 221. http://dx.doi.org/10.1094/pdis.2004.88.2.221b.

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Vetches (Vicia spp.) are planted alone or in combination with other plants as cover crops in vegetable production areas of California. December 2001 through February 2003, purple (V. benghalensis) and lana woollypod (V. villosa subsp. varia) vetches in the Salinas Valley (Monterey County) developed a foliar disease. Symptoms were small (≤5 mm in diameter), circular to oblong, purple brown-to-red brown spots that were visible from the adaxial and abaxial leaf sides, and occurred lower in the plant canopy. White sporulation was visible in the spot centers. Stems were infected and had elongated,

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Palma-Zambrano, Oscar J., Freddy Zambrano-Gavilanes, Diego Portalanza, and Felipe Rafael Garcés-Fiallos. "Ramularia leaf spot and boll rot are affected differently by organic and inorganic nitrogen fertilization in cotton plants." Bioscience Journal 38 (September 9, 2022): e38077. http://dx.doi.org/10.14393/bj-v38n0a2022-61479.

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Interaction among nitrogen fertilization using bovine manure, poultry manure, Jatropha curcas seed cake and urea, and the diseases Ramularia leaf spot (RLS) and Boll rot (BR), caused by Ramulariopsis pseudoglycines and Diplodia gossypina, respectively, in cotton plants (Gossypium hirsutum L.), was studied under field conditions. Intensity (incidence and severity in percentage) of RLS and incidence (%) of BR were evaluated over time, starting in reproductive stage B1 (first visible flower bud). A randomized complete block design with a 4x4 factorial arrangement was used (fertilizers x doses), t

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Turechek, W. W., and L. V. Madden. "Spatial Pattern Analysis and Sequential Sampling for the Incidence of Leaf Spot on Strawberry in Ohio." Plant Disease 83, no. 11 (1999): 992–1000. http://dx.doi.org/10.1094/pdis.1999.83.11.992.

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Spatial pattern of the incidence of strawberry leaf spot, caused by Mycosphaerella fragariae (Ramularia brunnea), was quantified on commercial strawberry farms in Ohio. For each planting of strawberry, one or two transects were randomly chosen, and the proportion of leaflets (out of 15) with leaf spot was determined from N = 29 to 87 evenly spaced sampling units. Based on a likelihood ratio test, the beta-binomial distribution described the frequency of diseased leaflets better than the binomial in 93% of the 59 data sets over 3 years. Estimates of mean incidence ranged from 0.0009 to 0.82, wi

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Dussart, F., R. Douglas, E. Sjökvist, P. N. Hoebe, S. H. Spoel, and G. R. D. McGrann. "Genome-Based Discovery of Polyketide-Derived Secondary Metabolism Pathways in the Barley Pathogen Ramularia collo-cygni." Molecular Plant-Microbe Interactions® 31, no. 9 (2018): 962–75. http://dx.doi.org/10.1094/mpmi-12-17-0299-r.

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Ramularia collo-cygni causes Ramularia leaf spot (RLS) disease of barley. The fungus develops asymptomatically within its host until late in the growing season, when necrotic lesions become visible on upper leaves. Fungal secondary metabolites (SM) have been proposed as important factors in RLS lesion formation but the biosynthetic pathways involved remain largely unknown. Mining the R. collo-cygni genome revealed the presence of 10 polyketide synthases (PKS), 10 nonribosomal peptide synthetases (NRPS), and 3 hybrid PKS-NRPS (HPS) identified within clusters of genes with predicted functions as

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Eskandari, F. M., D. K. Berner, J. Kashefi, and L. Strieth. "First Report of Leaf Spot Caused by a Cercosporella sp. on Centaurea solstitialis in Greece." Plant Disease 88, no. 12 (2004): 1382. http://dx.doi.org/10.1094/pdis.2004.88.12.1382a.

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Centaurea solstitialis L. (yellow starthistle [YST]), family Asteraceae, an invasive weed in California and the western United States is targeted for biological control. During the spring of 2004, an epidemic of dying YST plants was found near Kozani, Greece (40°22′07″N, 21°52′35″E, 634 m elevation). Rosettes of YST had small, brown leaf spots on most of the lower leaves. In many cases, these spots coalesced and resulted in necrosis of many of the leaves and death of the rosette. Along the roadside where the disease was found, >100 of the YST plants showed disease symptoms. Diseased plants

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Hestbjerg, H., H. Wolffhechel, and H. Dissjng. "Development of Ramularia Leaf Spot on Sugar Beet as Influenced by Temperature and the Age of the Host Plant." Journal of Phytopathology 140, no. 4 (1994): 293–300. http://dx.doi.org/10.1111/j.1439-0434.1994.tb00611.x.

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Mulhare, Joseph, Henry E. Creissen, and Steven Kildea. "Effectiveness of varietal resistance and risk prediction for the control of ramularia leaf spot of barley under Irish growing conditions." Crop Protection 139 (January 2021): 105317. http://dx.doi.org/10.1016/j.cropro.2020.105317.

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Eskandari, F. M., M. B. McMahon, W. L. Bruckart, and J. Littlefield. "First Report of Leaf Spot Caused by a Cercosporella sp. on Acroptilon repens in the United States." Plant Disease 90, no. 6 (2006): 833. http://dx.doi.org/10.1094/pd-90-0833b.

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In August 2005, leaf spots were observed on a sample of Acroptilon repens (L.) DC. (Russian knapweed [RK]) collected at the Charles M. Russell National Wildlife Refuge in Montana. Symptoms included circular to subcircular brown spots, 1 to 18 mm in diameter, with indefinite margins that sometimes had a thin, purple-to-rose border. Leaves placed in moist chambers developed conidiophores and conidia within 48 h. Stroma were subcuticular, pale yellowish; conidiophores were hyaline, zero to two septate, thin walled, smooth, unbranched, 31 to 91 × 2.8 to 5.6 μm; and conidia were solitary or in seco

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Stam, Remco, Hind Sghyer, Aurélien Tellier, Michael Hess, and Ralph Hückelhoven. "The Current Epidemic of the Barley Pathogen Ramularia collo-cygni Derives from a Population Expansion and Shows Global Admixture." Phytopathology® 109, no. 12 (2019): 2161–68. http://dx.doi.org/10.1094/phyto-04-19-0117-r.

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Ramularia leaf spot is becoming an ever-increasing problem in main barley-growing regions since the 1980s, causing up to 70% yield loss in extreme cases. Yet, the causal agent Ramularia collo-cygni remains poorly studied. The diversity of the pathogen in the field thus far remains unknown. Furthermore, it is unknown to what extent the pathogen has a sexual reproductive cycle. The teleomorph of R. collo-cygni has not been observed. To study the genetic diversity of R. collo-cygni and get more insights in its biology, we sequenced the genomes of 19 R. collo-cygni isolates from multiple geographi

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Zhang, M., T. Tsukiboshi, and I. Okabe. "First Report of Botrytis cinerea Causing Leaf Spot of Aquilegia vulgaris in Japan." Plant Disease 93, no. 4 (2009): 425. http://dx.doi.org/10.1094/pdis-93-4-0425a.

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European columbine, Aquilegia vulgaris L., Ranunculaceae, is an herbaceous flower widely used in gardens, parterres, and courtyards and is a traditional herbal plant. During the summer of 2008, leaf spots were observed on a plant cultivated along a roadside area in Nasushiobara, Tochigi, Japan. In some courtyards, the leaf spot affected more than 60% of the plants. Early symptoms appeared as small, round or elliptic, brown lesions on the leaves. Lesions expanded to 5 to 15 × 4 to 10 mm, irregular spots that were dark brown to black in the middle, with pale yellow-brown or purple-brown margins.

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McGrann, Graham R. D., Anna Stavrinides, Joanne Russell, et al. "A trade off between mlo resistance to powdery mildew and increased susceptibility of barley to a newly important disease, Ramularia leaf spot." Journal of Experimental Botany 65, no. 4 (2014): 1025–37. http://dx.doi.org/10.1093/jxb/ert452.

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Assinger, Thomas, Stefano F. F. Torriani, Salvatore Accardo, James Fountaine, and Siegrid Steinkellner. "Fungicide strategies and resistance of Ramularia collo-cygni to demethylation and succinate dehydrogenase inhibitors in Austrian winter barley (Hordeum vulgare)." Journal of Plant Diseases and Protection 128, no. 3 (2021): 735–48. http://dx.doi.org/10.1007/s41348-021-00454-x.

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AbstractRamularia collo-cygni B. Sutton and J.M. Waller is a major disease in Austrian barley-growing regions. To date, fungicide application is the most effective method to manage the disease; however, fungicide resistance to demethylation and succinate dehydrogenase inhibitors has developed over the last few years. In the growing seasons 2016/2017 and 2017/2018, field trials were carried out to analyze the efficiency of fungicide strategies based on different fungicide classes. Disease development, growth parameters and monitoring of CYP51 and sdh mutations were determined. Fungicide treatme

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Cheshkova, A. F. "Identification of fungal diseases in strawberry by analysis of hyperspectral images using machine learning methods." Vavilov Journal of Genetics and Breeding 29, no. 2 (2025): 310–19. https://doi.org/10.18699/vjgb-25-34.

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Leaf spot, leaf scorch and phomopsis leaf blight are the most common fungal diseases of strawberry in Western Siberia, which significantly reduce its yield and quality. Accurate, fast and non-invasive diagnosis of these diseases is important for strawberry production. This article explores the ability of hyperspectral imaging to detect and differentiate symptoms caused to strawberry leaves by pathogenic fungi Ramularia tulasnei Sacc., Marssonina potentillae Desm. and Dendrophoma obscurans Anders. The reflection spectrum of leaves was acquired with a Photonfocus MV1-D2048x1088-HS05-96-G2-10 hyp

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