Effect of Fusarium virguliforme and Heterodera glycines on soybean

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dc.contributor.author Brzostowski, Lillian Frances
dc.date.accessioned 2010-05-20T20:07:37Z
dc.date.available 2010-05-20T20:07:37Z
dc.date.issued 2010-05-20T20:07:37Z
dc.identifier.uri http://hdl.handle.net/2097/4188
dc.description.abstract Fusarium virguliforme, the soilborne fungus which causes sudden death syndrome (SDS) of soybean, and Heterodera glycines Ichinohe, soybean cyst nematode (SCN), are two economically important pathogens in the Midwest. The pathogens are often found together in soybean (Glycine max (L.) Merr.) fields. This study was conducted to determine the effect of soybean genotype, F. virguliforme populations, and H. glycines populations have upon yield and to examine the interaction between the two pathogens. In 2008 and 2009, four genotypes with different levels of resistance to SDS and H. glycines were planted at seven environments. F. virguliforme and H. glycines soil populations were quantified at planting, midseason, and harvest. At the end of the growing season, area under the disease progress curves of SDS, F. virguliforme root populations, and H. glycines reproductive indices were determined and plots harvested for seed yield. Soil populations of F. virguliforme and H. glycines at planting, midseason, and harvest varied across environments. Within environments, generally, they were not significantly different. Seed yield varied within and across environments. As disease pressure increased, the performance of resistant genotypes increased compared to susceptible genotypes. Genotypes resistant to SDS yielded higher than susceptible genotypes. There were negative correlations between yield and disease rating and F. virguliforme root populations. F. virguliforme soil populations and H. glycines populations at planting were positively correlated. It is important to manage both SDS and H. glycines in fields with a history of the two diseases. This can be achieved through genetic resistance. Information in this study will improve decisions regarding genotype selection to minimize losses to SDS and H. glycines. en_US
dc.description.sponsorship Kansas Soybean Commission en_US
dc.language.iso en_US en_US
dc.publisher Kansas State University en
dc.subject Soybean en_US
dc.subject Fusarium virguliforme en_US
dc.subject Heterodera glycines en_US
dc.subject Sudden Death Syndrome en_US
dc.subject Soybean Cyst Nematode en_US
dc.subject Soybean diseases en_US
dc.title Effect of Fusarium virguliforme and Heterodera glycines on soybean en_US
dc.type Thesis en_US
dc.description.degree Master of Science en_US
dc.description.level Masters en_US
dc.description.department Department of Agronomy en_US
dc.description.advisor William T. Schapaugh Jr en_US
dc.subject.umi Agriculture, Agronomy (0285) en_US
dc.date.published 2010 en_US
dc.date.graduationmonth August en_US

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