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Title: FIRST REPORT OF SCLEROTINIA BLIGHT ON PEANUT IN NEBRASKA

Author
item MELOUK, HASSAN
item JACKSON, K - OKLAHOMA STATE UNIV
item DAMICONE, J - OKLAHOMA STATE UNIV

Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/2003
Publication Date: 11/15/2003
Citation: Melouk, H.A., Jackson, K.E., Damicone, J.P. 2003. First report of sclerotinia blight on peanut in Nebraska [abstract]. In: Proceedings for the American Peanut Research and Education Society, July 8-11, 2003, Clearwater, Florida. 35:77.

Interpretive Summary:

Technical Abstract: An isolate of Sclerotinia sclerotiorum was recovered from symptomatic peanut (Arachis hypogaea L.) cv. Valencia C grown in a field near Clearwater, Nebraska, in 2002. Affected peanut plants had all the classical symptoms and signs of Sclerotinia blight, including the presence of sclerotia in the pith cavity. S. sclerotiorum was grown on potato dextrose agar containing 100 mg of streptomycin/L (SPDA) at 22 + or = to 2 C, where it produces mature sclerotia after 15 days of growth. The weight for ten sclerotia of S. sclerotiorum ranged from 0.05 - 0.08 g compared with 0.0065 - 0.0125 g for sclerotia from S. minor, the principal pathogen that causes Sclerotinia blight on peanut. In greenhouse experiments, pathogenicity of S. sclerotiorum was compared with that of S. minor on several peanut genotypes. Results showed that S. sclerotiorum was less virulent than S. minor where the length of lesions on inoculated detached shoots produced by S. sclerotiorum was about one firth of the for S. minor. Mycelial growth of S. minor and S. sclerotiorum was incompatible on SPDA in paired culture.