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Title: INCIDENCE OF SCLEROTINIA BLIGHT OF OKRUN PEANUT GROWN IN SOIL PREVIOUSLY PLANTED TO SCLEROTINIA MINOR-INFECTED WEEDS AND PEANUT

Author
item CHRISTOPHER, B - OKLAHOMA STATE UNIV
item Melouk, Hassan
item MURRAY, DON - OKLAHOMA STATE UNIV

Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 5/1/2006
Publication Date: 8/1/2005
Citation: Christopher, B., Melouk, H.A., Murray, D.S. 2005. Incidence of Sclerotinia Blight of Okrun peanut grown in soil previously planted to Sclerotinia minor-infected weeds and peanut [abstract]. Phytopathology. 95:S69.

Interpretive Summary:

Technical Abstract: Incidence of Sclerotinia Blight (SB) on Okrun peanut was determined in soil previously planted to Scleortinia minor-infected weeds and peanut. Five weeds (Crownbeard, Eclipta, Jimsonweed, Pitted morningglory and Sicklepod) and two peanut cultivars, Okrun and Southwest runner, were grown in bulb pans (30 cm dia) for 5-7 weeks at three plant densities (1, 4 or 8 plants/0.09 m2). Each plant was inoculated with S. minor and the bulb pan was enclosed in a clear polyethylene bag (38.1 x 91.44 cm) to ensure 95% relative humidity. A week after inoculation, the bags were removed and sclerotinia-infected plants and non-inoculated control plants were allowed to dry for four weeks. The dried plant material was incorporated into the soil, and four seeds of Okrun peanut were planted in each. Incidence (%) of SB on Okrun following infected weeds and peanut was recorded until harvest (150 days post-planting). SB occurred on Okrun following all infected species; however, there was not a significant difference (p=0.05) at the species level. Plant population had a significant effect (p=0.05) with 8 plts/0.09 m2 causing higher disease incidence than 1 plt/0.09 m2; 4 plts/0.09 m2 was not significantly different from the others. Our data suggest that infection of these weed species may play an important role in the epidemiology of SB in Okrun peanut.