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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #219495
Title: The influence of cultivar and chlorimuron application timing on spotted wilt disease and peanut yield.

Author
item PROSTKO, E - UNIV OF GA
item KEMERAIT, R - UNIV OF GA
item JOST, P - UNIV OF GA
item Johnson, Wiley - Carroll
item BROWN, S - UNIV OF GA
item Webster, Theodore

Submitted to: Peanut Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/1/2008
Publication Date: 5/11/2009
Citation: Prostko, E.P, Kemerait, R.C., Jost, P.H., Johnson, W.C., Brown, S.N., Webster, T.M. 2009. The influence of cultivar and chlorimuron application timing on spotted wilt disease and peanut yield. Peanut Science. 36:92-95.

Interpretive Summary: Chlorimuron is a postemergence herbicide applied mid-season to control Florida beggarweed in peanut. Chlorimuron temporarily stunts peanut and causes foliar chlorosis, which are also symptoms of the viral disease, spotted wilt. There has been speculation that chlorimuron increases incidence of spotted wilt in peanut. Therefore, research was conducted from 2000 through 2007 at fifteen locations in Georgia to evaluate the effects of chlorimuron and peanut cultivar on the incidence of spotted wilt. Chlorimuron at 9 g ai/ha was applied at various intervals ranging from 60 to 105 days after emergence (DAE) under weed-free conditions to six peanut cultivars; Georgia Green, AP-3, C-99R, AT-201, Georgia-02C, and Georgia-03L. When averaged over chlorimuron timings, AP-3, C-99R, and Georgia-02C had less spotted wilt than Georgia Green but only AP-3 produced yields equivalent to Georgia Green. AT-201 had significantly higher levels of spotted wilt and lower yields when compared to Georgia Green. Spotted wilt incidence of Georgia-03L did not differ from Georgia Green. However, the yields of this variety were less than Georgia Green. Differential tolerance of peanut cultivars to chlorimuron was not observed. When averaged over cultivars, chlorimuron applied at 60-69 DAE, 70-79 DAE, or 90-99 DAE increased the incidence of spotted wilt by 6-9%. However, peanut yields were not reduced by any application of chlorimuron.

Technical Abstract: Research was conducted from 2000 through 2007 at fifteen locations in Georgia to evaluate the effects of chlorimuron on the development of spotted wilt disease of peanut caused by tomato spotted wilt tospovirus. Chlorimuron at 9 g ai/ha was applied at various intervals ranging from 60 to 105 days after emergence (DAE) under weed-free conditions to new peanut cultivars. When averaged over chlorimuron timings, AP-3, C-99R, and Georgia-02C had less spotted wilt than Georgia Green but only AP-3 produced yields equivalent to Georgia Green. AT-201 had significantly higher levels of spotted wilt and lower yields when compared to Georgia Green. Spotted wilt incidence of Georgia-03L did not differ from Georgia Green. However, the yields of this variety were less than Georgia Green. Differential tolerance of peanut cultivars to chlorimuron was not observed. When averaged over cultivars, chlorimuron applied at 60-69 DAE, 70-79 DAE, or 90-99 DAE increased the incidence of spotted wilt by 6-9%. However, peanut yields were not reduced by any application of chlorimuron.