Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 4/15/2005
Publication Date: 12/15/2005
Citation: Damicone, J.P., Scruggs, W.D., Holbrook Jr, C.C. 2005. Yield response of selected entries from peanut core collection to fungicide for control of Sclerotinia blight [abstract]. In: Proceedings of the American Peanut Research and Education Society, July 11-15, 2005, Portsmouth, Virginia. 37:29. Interpretive Summary: not required
Technical Abstract: The peanut core collection was screened for reaction to Sclerotinia blight in the field in 2001. Core entries with promising levels of partial resistance were evaluated in replicated field trials in 2002 and 2003. From these evaluations, ten core entries with the best combination of resistance and yield were compared in the field to seven reference cultivars in 2004. Entries (whole plots) received either two applications of the fungicide fluazinam at 0.78 lb/A, or no fungicide for Sclerotinia blight (split plots). Sclerotinia blight appeared early in the season and reached a final incidence of 60% in untreated plots of ‘Okrun’, a susceptible reference cultivar. Fluazinam reduced disease incidence and increased yields (P<0.05) for all of the reference cultivars except for Southwest Runner and Tamspan 90. Yield responses ranged from 1400 to 1500 lb/A for Georgia Green and Tamrun 96 to over 2100 lb/A for Okrun. For the core entries, fluazinam reduced disease incidence for only (PI no.) 497599, 274193, and 458619. Fluazinam did not increase yields for nine of the core entries (497318, 497429, 497599, 331324, 274193, 259796, 285538, 268659, and 468195). Yields of 485619 were increased by fluazinam (P<0.05), but the response was only 230 lb/A. Core entries 497429, 497599, and 268359 had yields similar to Tamspan 90. Entry 497429 had less that 5% disease and yields similar to Southwest Runner. The resistance of most of the core entries, selected for a low incidence of Sclerotinia blight, was verified by the lack of a yield response to fluazinam.