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Frogeye Leaf Spot of Soybean: A Review and Proposed Race Designations for Isolates of Cercospora sojina Hara

^a USDA-ARS and Dep. of Horticulture and Crop Science, The Ohio State Univ., 1680 Madison Ave., Wooster, OH 44691
^b Dep. of Crop and Soil Sciences, Univ. of Georgia, Athens, GA 30602-7272
^c Dep. of Plant Pathology, Univ. of Georgia–Griffin Campus, Griffin, GA 30223
^d current address: Monsanto Co., 1551 Hwy. 210, Huxley, IA 50124
^e current address: USDA-ARS Soybean Germplasm, Pathology & Genetics Unit, Urbana, IL 61801

View larger version (106K): [in this window] [in a new window]   Figure 1. Characteristic frogeye leaf spot lesions resulting from Cercospora sojina infection of soybean leaves. (A) The lesions start as dark water-soaked spots and develop into well-defined lesions with light centers and dark borders; also shown is the head of an artificial frog. (B) Several adjacent lesions may coalesce and form larger irregular spots.

View larger version (16K): [in this window] [in a new window]   Figure 2. Ward minimum variance cluster analysis of 38 soybean differentials grouped based on their reaction (resistance and susceptibility) to 93 isolates of Cercospora sojina. Distances represent semipartial R2 values. These are equal to the between cluster sum of squares divided by the corrected total sum of squares and correspond to the decrease in the proportion of variance accounted for as a result of joining the two clusters. The bolded and underlined cultivars represents those that were selected as the differentials representing each group.

View larger version (10K): [in this window] [in a new window]   Figure 3. Ward minimum variance cluster analysis of 93 isolates of Cercospora sojina grouped based on the reaction (resistance and susceptibility) of the isolates on 10 soybean differential cultivars. Numbers below the dendrogram refer to semipartial R2 values, which correspond to the decrease in the proportion of variance taken into account, because of joining the two clusters. Numbers in parentheses refer to the specific clusters.