Research Reports: Residual Activity of Methomyl and Thiodicarb Against Fall Armyworm in Sweet Corn in Southern Florida

R. J. Marenco, R. E. Foster, C. A. Sanchez


The residual activities of methomyl and thiodicarb were evaluated based on the control of fall armyworm larvae at various post-application intervals in laboratory bioassays with leaves of field treated sweet corn. Mortality of second and fifth instar larvae were not significantly different for either of the two insecticides. Foliage fed to larvae three h after application (day 0) resulted in 50-60% mortality for methomyl and >95% mortality for thiodicarb. Mortality resulting from methomyl residues ranged from 5-50% and 1-15% at 1 and 2 d post-application, respectively. Larvae exposed to thiodicarb treated foliage suffered >90% mortality for the first 4-5 d and 70-80% on day 9. Thiodicarb residues induced about 50% mortality of fifth instar larvae on day 14.

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