Integrated Management of Peanut Diseases


Oklahoma State University

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Field trials completed in 2018 addressed the management of important peanut diseases in Oklahoma. The management strategies evaluated included chemical control and disease­resistant varieties. Efforts were made to develop and demonstrate a range of input levels for the fungicide programs. The diseases studied included early leaf spot, web blotch, southern blight and Sclerotinia blight. The cooperation of Bobby Weidenmaier and the staff at the Caddo Research Station is greatly appreciated. Additional funding for the trials was provided by BASF, FMC Corporation, Nichino and Syngenta. 
Results from 2018 are summarized in this report. In interpreting the results, small differences in treatment values should not be overemphasized. Statistical analysis at the 95 percent confidence level is applied to all the trial data. Unless values are statistically different (followed by different letters), little confidence 
can be placed in the superiority of one treatment or variety over another. 

Conditions at the Caddo Research Station were generally favorable for development of the peanut crop and diseases. Rainfall during the cropping period (May through October) totaled 3.5 inches for May; 3.75 inches for June; 4.03 inches for July; 1.61 inches for August; 7.31 inches for September; and 6.02 inches for October. Monthly rainfall totals were below normal in May, June and August, but were from 1.7 to 4.3 inches above normal in the other months. Average daily temperatures were above normal in May and June and below normal for the remaining months. The cool wet conditions favored severe foliar disease development. Web blotch was unusually severe in 2018 on Spanish varieties. Pod rot was a minor concern while levels of Sclerotinia blight and southern blights were somewhat below normal. However, locations where seed was inoculated with Sclerotium rolfsii, southern blight pressure was extreme. Adverse weather late in the season including excessive rainfall, cool temperatures and an early freeze, made harvest conditions challenging statewide. Harvest losses due to weather were a problem in commercial fields, but not in the trials reported here. 

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