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Journal articles on the topic 'Phytophthora megasperma'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Whisson, SC, BJ Howlett, ECY Liew, DJ Maclean, JM Manners, and JAG Irwin. "An Assessment of Genetic Relationships between Members of the Phytophthora megasperma Complex and Phytophthora vignae using Molecular Markers." Australian Systematic Botany 6, no. 4 (1993): 295. http://dx.doi.org/10.1071/sb9930295.

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Genetic relationships between Phytophora megasperma f. sp. glycinea (Pmg) and morphologically similar taxa, P. megasperma f. sp. medicaginis (Pmm), P. megasperma f. sp. trifolii (Pmt), P. megasperma from Douglas Fir (PmDF) and asparagus (PmAS) and Phytophthora vignae, were explored by restriction fragment length polymorphism (RFLP) analysis of nuclear DNA using random genomic multi-copy, cDNA, and ribosomal DNA probes as well as random amplified polymorphic DNA (RAPDs) and RFLP analysis of ribosomal intergenic spacer regions amplified by the polymerase chain reaction (PCR). Each method detecte

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2

Faris, M. A., F. E. Sabo, D. J. S. Barr, and C. S. Lin. "The systematics of Phytophthora sojae and P. megasperma." Canadian Journal of Botany 67, no. 5 (1989): 1442–47. http://dx.doi.org/10.1139/b89-192.

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Isolates of Phytophthora from alfalfa and soybean and the type isolate of Phytophthora megasperma Drechsler from hollyhock were compared morphologically, for temperature response, and pathogenically. Highly pathogenic, host-specific isolates from soybean and alfalfa, with relatively small oogonia, were identified as P. sojae Kaufmann and Gerdemann and divided into two formae speciales: f.sp. glycines and f.sp. medicaginis, respectively. Less pathogenic isolates from alfalfa with large oogonia were identified as P. megasperma and were compared favorably with Drechsler's original isolate and des

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3

Rutherford, F. S., and E. W. B. Ward. "Estimation of relative DNA content in nuclei of races of Phytophthora megasperma f. sp. glycinea by quantitative fluorescence microscopy." Canadian Journal of Genetics and Cytology 27, no. 5 (1985): 614–16. http://dx.doi.org/10.1139/g85-091.

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The fluorochrome 4,6-diamidino-2-phenylindole was used as a stain for nuclear DNA in the fungus Phytophthora megasperma f. sp. glycinea. Measurements of DNA contents were made cytofluorometrically using known haploid and diploid strains of Aspergillus nidulans as standards. No significant differences between DNA levels in nine races of Phytophthora megasperma f. sp. glycinea were found. The results are consistent with genetical data that all nine races are diploid in the vegetative state.Key words: Phytophthora, ploidy, fungi, DNA content, fluorescence.

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4

Richard, C., and J. G. Martin. "Pourriture phytophthoréenne de la luzerne au Québec : distribution géographique des symptômes et étude des facteurs édaphiques pouvant favoriser leur expression." Phytoprotection 72, no. 3 (2005): 87–95. http://dx.doi.org/10.7202/706008ar.

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Nous avons observé chez la luzerne (Medicago sativa) des symptômes attribuables à la pourriture phytophthoréenne (Phytophthora megasperma f. sp. medicaginis) dans les 12 régions agricoles du Québec, avec une présence plus marquée dans l'Outaouais, la Beauce, les Cantons de l'Est, la région de Québec et le Nord de Montréal. Les symptômes de pourriture étaient plus présents dans les dépressions des luzernières échantillonnées. Nous avons déterminé la texture et la capacité de rétention d'eau des sols échantillonnés, et trouvé aucune relation avec la pourriture phytophthoréenne. La culture de cul

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5

Hansen, E. M., and D. P. Maxwell. "Species of the Phytophthora megasperma Complex." Mycologia 83, no. 3 (1991): 376. http://dx.doi.org/10.2307/3759999.

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6

Hansen, E. M., and D. P. Maxwell. "Species of the Phytophthora Megasperma Complex." Mycologia 83, no. 3 (1991): 376–81. http://dx.doi.org/10.1080/00275514.1991.12026023.

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7

Huet, Jean-Claude, and Jean-Claude Pernollet. "Sequences of acidic and basic elicitin isoforms secreted by Phytophthora megasperma megasperma." Phytochemistry 33, no. 4 (1993): 797–805. http://dx.doi.org/10.1016/0031-9422(93)85277-x.

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8

Förster, Helga, T. G. Kinscherf, S. A. Leong, and Douglas P. Maxwell. "Restriction fragment length polymorphisms of the mitochondrial DNA of Phytophthora megasperma isolated from soybean, alfalfa, and fruit trees." Canadian Journal of Botany 67, no. 2 (1989): 529–37. http://dx.doi.org/10.1139/b89-074.

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The mtDNAs from 24 small oogonial soybean-specific Phytophthora megasperma f.sp. glycinea (Pmg) isolates, 10 small oogonial alfalfa-specific P. megasperma f.sp. medicaginis (Pmm) isolates, 2 small oogonial nonhost-specific P. megasperma isolates from apple, 6 large oogonial nonhost-specific P. megasperma isolates from alfalfa or cherry, and 1 high-temperature P. megasperma isolate from alfalfa were investigated by restriction fragment length polymorphism analysis. Restriction patterns of the mtDNAs obtained by digestion with six restriction endonucleases showed limited variation within isolate

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9

Ablett, G. R., B. T. Stirling, and J. D. Fischer. "RCAT Columbus soybean." Canadian Journal of Plant Science 76, no. 1 (1996): 135–36. http://dx.doi.org/10.4141/cjps96-023.

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RCAT Columbus is a late Maturity Group II soybean [Glycine max (L.) Merr.] cultivar with excellent yield potential and lodging resistance and with good tolerance to phytophthora root rot caused by Phytophthora megasperma f. sp. glycinea. Key words: Soybean, cultivar description

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10

Schechter, S. E., and L. E. Gray. "Oospore germination in Phytophthora megasperma f.sp. glycinea." Canadian Journal of Botany 65, no. 7 (1987): 1465–67. http://dx.doi.org/10.1139/b87-202.

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More than 80% of oospores of selected Phytophthora megasperma f.sp. glycinea isolates, grown on lima bean agar, germinated when tested on water agar. Percentage of germinated oospores varied widely among isolates. Oospore production was greatest at temperatures between 18 and 23 °C. Oospores germinated most rapidly at 27 °C. Exposure to light during oospore development had a negative effect on germination, while light during germination had a positive effect.

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11

Ablett, G. R., and J. W. Tanner. "RCAT Angora soybean." Canadian Journal of Plant Science 73, no. 1 (1993): 179–80. http://dx.doi.org/10.4141/cjps93-026.

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RCAT Angora is a mid-late Maturity Group II soybean (Glycine max (L.) Merr.) cultivar with excellent yield potential and resistance to most races of phytophthora root rot caused by Phytophthora megasperma f. sp. glycinea (RMG) found in Ontario. Key words: Soybean, cultivar description

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12

Ablett, G. R., and W. D. Beversdorf. "RCAT Persian soybean." Canadian Journal of Plant Science 71, no. 1 (1991): 175–76. http://dx.doi.org/10.4141/cjps91-018.

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RCAT Persian is a mid-late Maturity Group I soybean [Glycine max L. (Merr.)] cultivar with excellent yield potential, good lodging tolerance and resistance to most races of phytophthora root rot caused by Phytophthora megasperma f. sp. glycinea (Pmg) found in Ontario. Key words: Soybean, cultivar description

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13

Ablett, G. R., and J. W. Tanner. "Brock soybean." Canadian Journal of Plant Science 73, no. 1 (1993): 175–76. http://dx.doi.org/10.4141/cjps93-024.

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Brock is a mid-Maturity Group I soybean (Glycine max (L.) Merr.) cultivar with excellent yield potential and lodging tolerance and with resistance to most races of phytophthora root rot caused by Phytophthora megasperma f. sp. glycinea (PMG) found in Ontario. Key words: Soybean, cultivar description

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14

Ablett, G. R., and J. W. Tanner. "RCAT Tabby soybean." Canadian Journal of Plant Science 73, no. 4 (1993): 1103–4. http://dx.doi.org/10.4141/cjps93-148.

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RCAT Tabby is a mid Maturity Group II soybean [Glycine max (L.) Merr.] cultivar with excellent yield potential, lodging resistance and with resistance to most races of phytophthora root rot caused by Phytophthora megasperma f. sp. glycinea (PMG) found in Ontario. Key words: Soybean, cultivar description

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15

Kaiser, Clive, Philip B. Hamm, Stacy Gieck, et al. "In Vitro Fungicidal Activity of Calcium and Potassium Salts on Several Commercially Significant Plant Pathogens." HortScience 46, no. 6 (2011): 913–16. http://dx.doi.org/10.21273/hortsci.46.6.913.

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In vitro dose responses of several calcium and potassium salts were determined on some commercially significant plant pathogens, including: Helminthosporium solani, Fusarium oxysporum f. sp. pisi race 2, Colletotricum coccodes, Phytophthora cactorum, Phytophthora cinnamomi, Phytophthora erythroseptica, Phytophthora infestans, Phytophthora megasperma, Pythium ultimum, and Venturia inaequalis. Mycelial growth inhibition was both salt-specific and dose-related. Pythium ultimum was completely inhibited by 75 mg·L−1 or greater calcium propionate, but needed 300 mg·L−1 or greater of calcium acetate

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16

ANDERSON, T. R., and R. I. BUZZELL. ""DEFEATED" Rps1 GENE IN SOYBEAN." Canadian Journal of Plant Science 68, no. 1 (1988): 225–27. http://dx.doi.org/10.4141/cjps88-026.

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Field testing of 10 backcross-derived Rps1Rps1 cultivars/lines of soybean (Glycine max (L.) Merr.) and their recurrent rps1rps1 cultivars in the presence of compatible races of Phytophthora megasperma f. sp. glycinea showed no residual effects of race-specific resistance on tolerance of soybean to the disease.Key words: Soybean, race-specific resistance, tolerance, phytophthora rot

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17

Wicks, T., and TC Lee. "Phytophthora crown rot of almond trees." Australian Journal of Agricultural Research 37, no. 3 (1986): 277. http://dx.doi.org/10.1071/ar9860277.

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Phytophthora cambivora, P. citrophthora, P. cryptogea, and P. megasperma were isolated from either crown cankers or the soil around the crown of declining almond trees in South Australia. Severe root rot and crown cankers developed on Chellaston almond seedlings grown in soil artificially infested with the A1 but not the A2 mating type of P. cambivora. Cankers on inoculated plants were similar to those on naturally infected plants. Cankers did not develop on almond seedlings grown in soil infested with either P. citrophthora, P. cryptogea or P. megasperma. Neither extensive root rotting nor cr

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18

Thomidis, T., J. Cullum, K. Elena, and S. N. Jeffers. "Relative Resistance of Four Peach Rootstocks to Phytophthora cactorum and Phytophthora megasperma." Journal of Phytopathology 149, no. 10 (2001): 599–604. http://dx.doi.org/10.1046/j.1439-0434.2001.00677.x.

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19

Kong, Ping, Gary W. Moorman, John D. Lea-Cox, David S. Ross, Patricia A. Richardson, and Chuanxue Hong. "Zoosporic Tolerance to pH Stress and Its Implications for Phytophthora Species in Aquatic Ecosystems." Applied and Environmental Microbiology 75, no. 13 (2009): 4307–14. http://dx.doi.org/10.1128/aem.00119-09.

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ABSTRACT Phytophthora species, a group of destructive plant pathogens, are commonly referred to as water molds, but little is known about their aquatic ecology. Here we show the effect of pH on zoospore survival of seven Phytophthora species commonly isolated from irrigation reservoirs and natural waterways and dissect zoospore survival strategy. Zoospores were incubated in a basal salt liquid medium at pH 3 to 11 for up to 7 days and then plated on a selective medium to determine their survival. The optimal pHs differed among Phytophthora species, with the optimal pH for P. citricola at pH 9,

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20

BUZZELL, R. I., T. R. ANDERSON, A. S. HAMILL, and T. W. WELACKY. "HAROSON SOYBEAN." Canadian Journal of Plant Science 69, no. 4 (1989): 1265–66. http://dx.doi.org/10.4141/cjps89-150.

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Haroson is a backcross-derived soybean (Glycine max) cultivar which is similar to its recurrent parent, Hodgson, except for its resistance to Phytophthora megasperma f. sp. glycinea conferred by Rps1-c.Key words: Soybean cultivar, Haroson soybean

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21

Browne, Gregory T. "Resistance to Phytophthora Species among Rootstocks for Cultivated Prunus Species." HortScience 52, no. 11 (2017): 1471–76. http://dx.doi.org/10.21273/hortsci10391-17.

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Many species of Phytophthora de Bary are important pathogens of cultivated Prunus L. species worldwide, often invading the trees via their rootstocks. In a series of greenhouse trials, resistance to Phytophthora was tested in new and standard rootstocks for cultivated stone fruits, including almond. Successive sets of the rootstocks, propagated as hardwood cuttings or via micropropagation, were transplanted into either noninfested potting soil or potting soil infested with Phytophthora cactorum (Lebert & Cohn) J. Schöt., Phytophthora citricola Sawada, Phytophthora megasperma Drechs, or Phy

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22

ABLETT, G. R., and W. D. BEVERSDORF. "RCAT ALLIANCE SOYBEAN." Canadian Journal of Plant Science 70, no. 3 (1990): 855–56. http://dx.doi.org/10.4141/cjps90-103.

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RCAT Alliance is a late Maturity Group I soybean [Glycine max L. (Merr.)] cultivar which carries the Rps1-c gene for resistance to the major races of Phytophthora megasperma f. sp. glycinea in Ontario.Key words: Soybean, cultivar description

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23

Collins, D. J., R. P. Pacumbaba, and V. Tsapra. "Races of Phytophthora megasperma f.sp. glycinea (Phytophthora Rot) Affecting Soybeans in North Alabama." Journal of Phytopathology 113, no. 1 (1985): 43–46. http://dx.doi.org/10.1111/j.1439-0434.1985.tb00823.x.

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24

Belisario, A., L. Luongo, M. Galli, and S. Vitale. "First Report of Phytophthora megasperma Associated with Decline and Death of Common Walnut Trees in Italy." Plant Disease 96, no. 11 (2012): 1695. http://dx.doi.org/10.1094/pdis-05-12-0470-pdn.

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Common walnut (Juglans regia L.) is an important nut crop in Italy, which is the fifth largest producer of walnut in Europe. In recent years, walnut decline and subsequent death has increased in many Italian commercial orchards. In the summer of 2010, several declining trees were present in waterlogged area of a walnut orchard located in the Veneto region. Symptoms included sparse foliage, wilting, and shoot and branch dieback. By the next year, a larger area of about 1 ha with 20% of dead trees was present, and soil/root samples were subjected to azalea leaf baiting and successively cultured

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25

Sánchez-Hernández, M. E., A. Ruiz-Dávila, and A. Trapero-Casas. "First Report of Phytophthora megasperma and Pythium irregulare As Olive Tree Root Pathogens." Plant Disease 81, no. 10 (1997): 1216. http://dx.doi.org/10.1094/pdis.1997.81.10.1216b.

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Several species of the genus Phytophthora are associated with root rot and trunk cankers in olive trees (Olea europaea L.). Among them, Phytophthora megasperma has been cited as being associated with olive root rots in Greece (1). Unidentified species of Pythium and Phytophthora have also been associated with olive tree root rots in the United States. However, the status of P. megasperma and Pythium spp. as olive tree root pathogens has remained unclear. Following a 5-year period of severe drought in southern Spain, autumn-winter rainfall rates in 1996 to 1997 steadily increased in both quanti

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26

Evans, Michael R., and Stephen B. Gaul. "012 Inhibition of Phytophthora megasperma in Coconut Coir-based Root Substrates." HortScience 34, no. 3 (1999): 442F—443. http://dx.doi.org/10.21273/hortsci.34.3.442f.

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Glycine max (soybean) seed were sown in root substrates composed of 80:0:20 or 0:80:20 coconut coir dust (coir):Sphagnum peat (peat):perlite (v/v) amended with dolomitic limestone to a pH of 5.5. Substrates were inoculated with Phytophthora megasperma races 5 and 25 isolated from soybean and grown in dilute liquid V-8 cultures. Uninoculated controls were included. Containers were watered daily to maintain moisture levels at or near container capacity. The experiment was repeated twice. Plants grown in peat-based root substrates inoculated with P. megasperma suffered 50% to 100% mortality. No p

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27

KIMISHIMA, Etsuo, Yoshinori KOBAYASHI, and Takeshi NISHIO. "Phytophthora megasperma Drechsler newly isolated from white trumpet lily." Japanese Journal of Phytopathology 54, no. 4 (1988): 427–35. http://dx.doi.org/10.3186/jjphytopath.54.427.

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28

Ristaino, Jean B., Michael Madritch, Carol L. Trout, and Gregory Parra. "PCR Amplification of Ribosomal DNA for Species Identification in the Plant Pathogen Genus Phytophthora." Applied and Environmental Microbiology 64, no. 3 (1998): 948–54. http://dx.doi.org/10.1128/aem.64.3.948-954.1998.

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ABSTRACT We have developed a PCR procedure to amplify DNA for quick identification of the economically important species from each of the six taxonomic groups in the plant pathogen genusPhytophthora. This procedure involves amplification of the 5.8S ribosomal DNA gene and internal transcribed spacers (ITS) with the ITS primers ITS 5 and ITS 4. Restriction digests of the amplified DNA products were conducted with the restriction enzymesRsaI, MspI, and HaeIII. Restriction fragment patterns were similar after digestions with RsaI for the following species: P. capsici andP. citricola; P. infestans

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29

Burgess, Treena I., Janet L. Webster, Juanita A. Ciampini, Diane White, Giles E. StJ Hardy, and Michael J. C. Stukely. "Re-evaluation of Phytophthora Species Isolated During 30 Years of Vegetation Health Surveys in Western Australia Using Molecular Techniques." Plant Disease 93, no. 3 (2009): 215–23. http://dx.doi.org/10.1094/pdis-93-3-0215.

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For 30 years, large-scale aerial photography has been used to map the extent of Phytophthora dieback disease in native forests in the southwest of Western Australia, with validation of the observations involving routine testing of soil and root samples for the presence of Phytophthora cinnamomi. In addition to P. cinnamomi, six morpho-species have been identified using this technique: P. citricola, P. megasperma, P. cryptogea, P. drechsleri, P. nicotianae, and P. boehmeriae. In recent years, many new Phytophthora species have been described worldwide, often with similar morphology to existing

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30

Rennie, B. D., V. D. Beversdorf, R. I. Buzzell, and T. R. Anderson. "Evaluation of four Japanese soybean cultivars for Rps alleles conferring resistance to Phytophthora megasperma f. sp. glycinea." Canadian Journal of Plant Science 72, no. 1 (1992): 217–20. http://dx.doi.org/10.4141/cjps92-022.

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Four Japanese soybean (Glycine max (L) Merr.) cultivars (Fujiotome (PI 360836), Misaodaizu (PI 360839), Nezumisaya (PI 360841) and Honiku 65 (PI 360837)) were evaluated for Rps alleles conferring resistance for Phytophthora megasperma (Drechs.) f. sp. glycinea (Hildeb.) Kuan & Erwin. Fujiotome contains Rps1-a and Rps5; Misaodaizu contains Rsp1-c and Rps3; and Nezumisaya contains Rps1-b and a new allele, designated Rps? (Nezumisaya). Honiku 65 is susceptible but two variants obtained from it each contain a new Rps allele designated Rps? (OX939) and Rps? (OX940).Key words: Soybean, Phytophth

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31

Ho, H. H. "Notes on the Heterothallic Behavior of Phytophthora megasperma from Alfalfa." Mycologia 78, no. 2 (1986): 306. http://dx.doi.org/10.2307/3793181.

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32

Hansen, Everett M., Wayne F. Wilcox, Paul W. Reeser, and Wendy Sutton. "Phytophthora rosacearumandP. sansomeana, new species segregated from thePhytophthora megasperma“complex”." Mycologia 101, no. 1 (2009): 129–35. http://dx.doi.org/10.3852/07-203.

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33

Vettraino, A. M., and A. Vannini. "Scotch broom: a new host of Phytophthora megasperma in Italy." Plant Pathology 52, no. 3 (2003): 417. http://dx.doi.org/10.1046/j.1365-3059.2003.00839.x.

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34

Ho, H. H. "Notes on the Heterothallic Behavior of Phytophthora Megasperma from Alfalfa." Mycologia 78, no. 2 (1986): 306–9. http://dx.doi.org/10.1080/00275514.1986.12025248.

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35

Ryley, MJ, HF Mosetter, and JL Rose. "Yield losses of soybeans due to Phytophthora megasperma f.sp. Glycinea." Australian Journal of Agricultural Research 40, no. 6 (1989): 1161. http://dx.doi.org/10.1071/ar9891161.

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Field trials were conducted in two seasons to determine the influence of Phytophthora megasperma f.sp. glycinea on seed yields of soybean genotypes with different levels of resistance. The fungicide metalaxyl, applied as a seed dressing and soil drenches, was used to control the disease. The cultivar Davis, which has high field resistance, did not suffer significant losses in either year. whereas the yield depression of less resistant genotypes ranged up to 72%, depending on the genotype and year. In 198 1 - 82 high death rate of plants occurred early in the season, but yield losses were less

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36

Luongo, L., A. Haegi, M. Galli, S. Berti, S. Vitale, and A. Belisario. "First Report of Phytophthora megasperma Causing Decline and Death on Celtis australis in Italy." Plant Disease 99, no. 1 (2015): 155. http://dx.doi.org/10.1094/pdis-05-14-0534-pdn.

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European hackberry (Celtis australis L.) is a popular shade tree mainly planted in southern Europe and known to be tolerant to dry and poor soils. In early autumn 2013, hackberry plants grown in soil in a commercial nursery located in the floodplain in Umbria region showed symptoms of wilting, dieback, and death. Up to 100% of the canopy was affected, and over 60% of the plants were symptomatic or dead. A Phytophthora species was consistently isolated from symptomatic 6-year-old plants by plating small pieces of collar and root tissues, cut from the margin of dark-brown necrotic lesions, onto

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37

Cacciola, S. O., G. E. Agosteo, and G. Magnano di San Lio. "Collar and Root Rot of Olive Trees Caused by Phytophthora megasperma in Sicily." Plant Disease 85, no. 1 (2001): 96. http://dx.doi.org/10.1094/pdis.2001.85.1.96a.

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Olive (Olea europea L.) is grown on about 154,000 ha in Sicily (southern Italy). In the summer of 1999, a few 3-year-old olive trees with decline symptoms were observed in a recently planted commercial orchard in the Enna province (Sicily). The trees were propagated on wild olive (O. europea L. var. sylvestris Brot.) rootstock. Aerial symptoms, consisting of leaf chlorosis, wilting, defoliation, and twig dieback followed in most cases by plant death, were associated with root rot and basal stem cankers. A Phytophthora sp. was consistently isolated from rotted rootlets and trunk cankers using t

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38

Gijzen, Mark, Helga Förster, Michael D. Coffey, and Brett Tyler. "Cosegregation of Avr4 and Avr6 in Phytophthora sojae." Canadian Journal of Botany 74, no. 5 (1996): 800–802. http://dx.doi.org/10.1139/b96-100.

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The F2 progeny resulting from a cross of Phytophthora sojae race 2 (avirulent on Rps4 and Rps6) and race 7 (virulent on Rps4 and Rps6) were tested for their ability to cause disease on soybean plants carrying the Rps4 or the Rps6 resistance genes. Of 55 F2 progeny analyzed, 41 individuals were avirulent on both of these genes and 14 were virulent on Rps4 and Rps6, indicating that avirulence on Rps4 and Rps6 is dominant and linked. These results support the suggestion that the soybean–Phytophthora relationship is a gene for gene interaction and that the presumptive Avr4 and Avr6 genes are eithe

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39

Beversdorf, W. D., D. J. Hume, P. Gostovic, J. C. Muscat, and S. Pararajasingham. "OAC Musca soybean." Canadian Journal of Plant Science 71, no. 2 (1991): 497–98. http://dx.doi.org/10.4141/cjps91-067.

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OAC Musca is a soybean (Glycine max (L.) Merr.) cultivar which is 3 d earlier than Hodgson and 2% higher in yield in Ontario trials. It has exhibited low field losses to Phytophthora megasperma f. sp. glycinea in Ontario testing, is a tall cultivar and is intended for use on clay soils. Key words: Soybean, cultivar description

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40

Buzzell, R. I., T. R. Anderson, A. S. Hamill, and T. W. Welacky. "Harovinton soybean." Canadian Journal of Plant Science 71, no. 2 (1991): 525–26. http://dx.doi.org/10.4141/cjps91-075.

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Harovinton is a large-seeded soybean (Glycine max) cultivar with a greater protein content than oilseed cultivars and is suitable for tofu production. It is resistant to Phytophthora megasperma f. sp. glycinea (Rps1-c) and tolerant of metribuzin herbicide (Hm). Production will be on a contract basis with Canada Packers, Inc. Key words: Cultivar description, Harovinton soybean

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41

Bray, RA, and JAG Irwin. "Recurrent selection for resistance to Stemphylium vesicarium within the lucerne cultivars Trifecta and Sequel." Australian Journal of Experimental Agriculture 29, no. 2 (1989): 189. http://dx.doi.org/10.1071/ea9890189.

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Two cycles of recurrent selection for resistance to Stemphylium leaf spot (caused by Stemphylium vesicarium) based on half-sib family performance were made within the lucerne cultivars Trifecta and Sequel. Within Trifecta, 1 generation of selection was sufficient to increase the level of resistance to that of UC 1249 (resistant check), while 2 generations were necessary to obtain equivalent levels of resistance in Sequel. The Stemphylium resistant lines maintained adequate levels of resistance to anthracnose (caused by Colletotrichum trifolii) and Phytophthora root rot (caused by Phytophthora

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42

Cacciola, S. O., A. Pane, D. E. L. Cooke, F. Raudino, and G. Magnano di San Lio. "First Report of Brown Rot and Wilt of Fennel Caused by Phytophthora megasperma in Italy." Plant Disease 90, no. 1 (2006): 110. http://dx.doi.org/10.1094/pd-90-0110a.

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Fennel (Foeniculum vulgare Mill. var. azoricum (Mill.) Thell.) in the Apiaceae family is native to southern Europe and southwestern Asia. It is an economically important crop in Italy that produces approximately 85% of all fennel worldwide. The main producing regions are Apulia, Campania, Latium, and Calabria. During the late winter of 2004 in the Crotone Province of the Calabria Region, following heavy rains, patches of fennel plants with symptoms of brown, soft rot of the bulb-like structure formed by the thickened leaf bases, development of yellow leaves, stunting, and wilting of the entire

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Lowe, KF, MJ Ryley, and TM Bowdler. "Lack of control of phytophthora root in lucerne (Medicago sativa) by foliar applications of phosphorus." Australian Journal of Experimental Agriculture 31, no. 4 (1991): 503. http://dx.doi.org/10.1071/ea9910503.

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Application of phosphonate was investigated as a means of controlling phytophthora root rot (Phytophthora megasperma f. sp. medicaginis) in lucerne (Medicago sativa). Foliar sprays of the chemical at rates of 2, 4 and 8 g/L did not improve the persistence or dry matter production of susceptible or resistant cultivars of lucerne, despite a small reduction in the degree of damage inflicted on lucerne plants by a severe epiphytotic of the disease. Regular monthly applications gave no better control than single applications at establishment or at the time of the development of an epiphytotic. It i

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44

Latorre, B. A., M. E. Rioja, and W. F. Wilcox. "Phytophthora Species Associated with Crown and Root Rot of Apple in Chile." Plant Disease 85, no. 6 (2001): 603–6. http://dx.doi.org/10.1094/pdis.2001.85.6.603.

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Phytophthora cactorum, P. cryptogea, P. gonapodyides, and P. megasperma were isolated from necrotic root and crown tissues or the rhizospheres of apple trees exhibiting typical symptoms of Phytophthora root and crown rot in the Central Valley of Chile. Representative isolates of all four species were pathogenic on a variety of apple rootstocks and scions in trials conducted on excised shoots and 1-year-old MM.106 rootstock grown for 4 months in infested potting medium. P. cactorum was the most frequently isolated species and the most virulent in pot tests, although a significant Phytophthora s

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Rutherford, F. S., and E. W. B. Ward. "Evidence for genetic control of oospore abortion in Phytophthora megasperma f. sp. glycinea." Canadian Journal of Botany 63, no. 9 (1985): 1671–73. http://dx.doi.org/10.1139/b85-231.

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Levels of oospore abortion were determined in nine physiologic races of the soybean pathogen Phytophthora megasperma f. sp. glycinea. In five of the races, ratios of aborted to nonaborted oospores conformed to classical Mendelian ratios, consistent with diploidy in this species. Levels of abortion differed among races, providing a basis for selection of lines with low levels of oospore abortion.

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46

Oudemans, Peter V. "Phytophthora Species Associated with Cranberry Root Rot and Surface Irrigation Water in New Jersey." Plant Disease 83, no. 3 (1999): 251–58. http://dx.doi.org/10.1094/pdis.1999.83.3.251.

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A lupine baiting technique was used to detect the presence of Phytophthora spp. in several streams, irrigation reservoirs, and drainage canals used in cranberry cultivation. P. cinnamomi was found to be widely distributed throughout the study area in the southern New Jersey Pinelands, and was present both upstream and downstream of agricultural activities. A second species, identified as P. megasperma, was more restricted in its distribution and was never isolated from a water system that did not also contain P. cinnamomi. In a survey of commercial cranberry production, 80% of the acreage repr

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47

Benhamou, Nicole, Patrice Rey, Karine Picard, and Yves Tirilly. "Ultrastructural and Cytochemical Aspects of the Interaction Between the Mycoparasite Pythium oligandrum and Soilborne Plant Pathogens." Phytopathology® 89, no. 6 (1999): 506–17. http://dx.doi.org/10.1094/phyto.1999.89.6.506.

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The interaction between the oomycete Pythium oligandrum and various soilborne oomycete and fungal plant pathogens (P. ultimum, P. aphanidermatum, Fusarium oxysporum f. sp. radicis-lycopersici, Verticillium albo-atrum, Rhizoctonia solani, and Phytophthora megasperma) was studied by light and electron microscopy in order to assess the relative contribution of mycoparasitism and antibiosis in the antagonistic process. Scanning electron microscope investigations of the interaction regions showed that structural alterations of all pathogenic fungi and oomycetes (except for Phytophthora megasperma)

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Hayes, J. E., H. S. Aldwinckle, and S. N. Jeffers. "ROOT AND CROWN ROT OF CHERRY IN NEW YORK CAUSED BY PHYTOPHTHORA MEGASPERMA AND PHYTOPHTHORA CRYPTOGEA." Acta Horticulturae, no. 169 (August 1985): 187–88. http://dx.doi.org/10.17660/actahortic.1985.169.26.

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Mora-Sala, Beatriz, Mónica Berbegal, and Paloma Abad-Campos. "The Use of qPCR Reveals a High Frequency of Phytophthora quercina in Two Spanish Holm Oak Areas." Forests 9, no. 11 (2018): 697. http://dx.doi.org/10.3390/f9110697.

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The struggling Spanish holm oak woodland situation associated with Phytophthora root rot has been studied for a long time. Phytophthora cinnamomi is considered the main, but not the only species responsible for the decline scenario. This study verifies the presence and/or detection of Phytophthora species in two holm oak areas of Spain (southwestern “dehesas” and northeastern woodland) using different isolation and detection approaches. Direct isolation and baiting methods in declining and non-declining holm oak trees revealed Phytophthora cambivora, Phytophthora cinnamomi, Phytophthora gonapo

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Bhattacharyya, M. K., and E. W. B. Ward. "Differential sensitivity of Phytophthora megasperma f.sp. glycinea isolates to glyceollin isomers." Physiological Plant Pathology 27, no. 3 (1985): 299–310. http://dx.doi.org/10.1016/0048-4059(85)90043-8.

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