Reference Report for IND88020780
| Title: | Distribution and management of red crown rot of soybean in Louisiana. |
| Authors: | Berner, D.K., Snow, J.P., White, E.P., Berggeren, G.T. |
| Source: | J. Appl. Agricul. Res. 3(3):160-166 |
| Abstract: | This study examines the distribution, soybean cultivar resistance, and influence of planting date in Louisiana on red crown rot (RCR) disease incidence and yield loss. Distribution of the causal fungus, Calonectria crotalariae, suggests the organism may have been introduced into the United States on the dye crop indigo. Movement of fungal propagules from the former indigo plantations by flood water may account for the current distribution of the disease in 17 soybean-producing parishes in Louisiana. Using the presence of perithecia as a proven means of assessing disease severity, the maturity group VII cultivars were found to be relatively tolerant to RCR. While delayed planting resulted in decreased RCR incidence, this relationship was significant only for the susceptible maturity group of V cultivar, ""Bedford."" Both RCR incidence and planting date had a significant effect on ""Bedford"" yield and when these effects were statistically analyzed, a 50% yield reduction was predicted at 100% RCR incidence. Yield of the more tolerant maturity group VII cultivar, ""Braxton,"" was not significantly affected by RCR but was reduced by delayed planting. |
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