Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 9/16/1999
Publication Date: N/A
Technical Abstract: Three types of inoculum including germinating sclerotia (GS) on carrot root shavings (0.5 mm thick), dry mycelia (DM), and ungerminated sclerotia (UGS), in comparison with mycelial plug (MP) on potato-dextrose agar (Peanut Sci. 19:58-62) were used to inoculate detached shoots of two peanut genotypes (Okrun, a sclerotinia-susceptible cultivar; Southwest Runner, a sclerotinia-resistant cultivar) under greenhouse conditions. GS and DM resulted in shoot infection while UGS did not. Lesions on stems were measured at 2,4, 6, and 8 days after inoculation. Lesion lengths on Okrun at 8 days after inoculation were 2.5, 4.3, and 6.3 cm for DM, GS, and MP, respectively. Lesion lengths on Southwest Runner at 8 days were 1.9, 3.1, and 4.4 cm for DM, GS, and MP, respectively. The slower progress of disease with GS and DM mimics field reaction of peanut germplasm to Sclerotinia minor.