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Title: REACTION OF RUNNER CULTIVARS AND BREEDING LINES OF PEANUT TO SCLEROTINIA BLIGHT AND THEIR RESPONSES TO FUNGICIDE TREATMENT

Author
item DAMICONE, JOHN - OKLA STATE UNIV
item Melouk, Hassan
item JACKSON, KEN - OKLA STATE UNIV

Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 7/10/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Tamspan 90, a Sclerotinia blight-resistant spanish cultivar, has been used to reduce yield losses and production costs in Oklahoma fields infested with Sclerotinia minor. Resistant runner cultivars are needed because of the low demand for spanish peanuts. Two recently released runner cultivars (Tamrun96 and Georgia Green) and 2 runner breeding lines from TAMU (TX901417 and TX901338-2) were evaluated for disease reaction compared wit Okrun, a susceptible runner cultivar, and Tamspan 90. Over 5 trials in 1996 and 1997, disease incidence was highest for Okrun and lowest for Tamspan 90. The most resistant runner entries were TX901338-2 and TX901417. Tamrun 96 and Georgia Green also had less disease than Okrun. Yields for all entries were higher than for Okrun: highest for TX901338-2 and Tamrun 96, intermediate for Georgia Green and TX901417, and lowest for Tamspan 90. In 2 trials in 1997 where disease incidence was moderate, entries received applications of iprodione, dicloran, fluazinam, or no treatment. Entries responded similarly to fungicide treatment. At both locations, mean disease incidence across fungicide treatments for all entries was at least 50% lower than for Okrun. However, mean yields across fungicide treatments were greater than Okrun only for Tamrun 96 at both locations, and for TX901338-2 and Georgia Green at 1 location. However, mean yields across entries were greater than the control only for the treatment with 2 applications of fluazinam. Tamrun 96 and Georgia Green appear to be moderately resistant to Sclerotinia blight and may be useful for reducing losses to this disease in runner production. TX901338-2 and TX901417 have better resistance, but did not yield higher than Tamrun 96 in any of the trials. Further evaluations where disease incidence is high are warranted.