Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 9/30/1997
Publication Date: N/A
Technical Abstract: The reaction of four peanut genotypes to 12 randomly selected isolates of Sclerotinia minor was evaluated under greenhouse conditions using a detached shoot technique (Peanut Sci. 19:58-62). Three and seven days after inoculation, lengths of lesions on stems were measured. Data was analyzed using a general linear model, and the least significant difference (LSD) was used to delineate the genotypic response. Lesion expansion rate on Okrun (sclerotinia-susceptible) in nine isolates was significantly (p=0.05) higher than on the sclerotinia-resistant genotypes Southwest Runner, TX901639-3, and TX901338-2. Pooled over two experiments, and over isolates, lesion expansion rates were 9.7, 5.7, 5.7, and 4.2 mm/24 hr for Okrun, Southwest Runner, TX901639-3, and TX901338-2, respectively, and the LSD was 0.10 mm/24 hr (p=0.05). These results strengthen the validity of the greenhouse evaluation procedure in identifying germplasm resistant to Sclerotinia minor.