Fall Armyworm Symposium: Use of Pyrethroids, Methomyl, and Chlorpyrifos to Control Fall Armyworm (Lepidoptera: Noctuidae) in Whorl Stage Field Corn, Sweet Corn, and Sorghum

It is important to identify new insecticides with efficacy for the fall armyworm, Spodoptera frugiperda Smith, to allow greater flexibility in management programs and to retard the development of resistance. Field trials showed all rates tested of the pyrethroid insecticides tralomethrin, flucythrinate, and cyhalothrin to be as effective as manufacturers' recommended rates of chlorpyrifos and methomyl against fall armyworm in whorl stage sweet corn, field corn, and sorghum. Permethrin, cypermethrin, fenvalerate, esfenvalerate, fluvalinate, and cyfluthrin gave erratic control of fall armyworm injury in field corn and sweet corn compared with chlorpyrifos and methomyl; these insecticides were comparable with other treatments against fall armyworm in whorl stage sorghum.