Abstract
ABSTRACTCharcoal rot, caused by the fungus Macrophomina phaseolina (Tassi) Goid., is a disease of soybean (Glycine max (L.) Merr.) that causes yield loss worldwide. The purpose of this research was to determine the effects of charcoal rot on the yield loss of six individual soybean genotypes grown in infested, irrigated plots. Overall, colony-forming unit (CFU) levels were low (≤5,500). Even so, regression analysis indicated a significant (P ≤ 0.05) negative linear relationship of CFUs with seed yield for one genotype in two out of 3 years (2011, r2 = 0.43, P = 0.0403; 2013, r2 = 0.71, P = 0.0023) at levels of CFUs that ranged from zero to 1,300. At low CFU levels, none of the other five genotypes showed a significant (P ≤ 0.05) linear relationship. Hence, not all genotypes that were colonized by M. phaseolina lost seed yield. These results indicated that yield loss was dependent on both genotype and environment.
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