Reference Report for SoyBase2249730128
| Title: | Rhizoctonia foliar blight reactions and seed yields in soybean. |
| Authors: | Harville, B.G., Russin, J.S., Habetz, R.J. |
| Source: | Crop Sci. 1996, 36(3):563-566 |
| Abstract: | Rhizoctonia foliar blight (RFB) is caused by the fungus Rhizoctonia solani Kuhn anastomosis group 1, intraspecific groups IA and IB. The disease affects more than half of the soybean (Glycine mar (L.) Merr.) acreage in Louisiana. Although less-susceptible cultivars are recommended, reliable estimates of cultivar susceptibility have been difficult to obtain because of several factors, including uneven distribution of RFB in fields, differences in plant developmental stage at time of infection, and the requirement for free moisture in RFD development. The objective of this study was to screen commercial soybean cultivars grown throughout the southern USA, as well as advanced breeding genotypes, for field reaction to RFB in south Louisiana. Ninety-one soybean genotypes, representing Maturity Groups IV, V, VI, and VII, were evaluated at two locations in 1993 and 1994. Disease ratings were made with a severity scale that included pods as well as foliage. A range of reactions to RFB was observed among cultivars, but most were severely damaged. Significant negative correlations between RFB severity and yield occurred among cultivars in all Maturity Groups. Results identified several cultivars, notably Buckshot 66 and Pioneer variety 9593, with promising levels of resistance. |
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