Presence of Corn Earworm and Fall Armyworm (Lepidoptera: Noctuidae) Populations in Sweet Corn and their Susceptibility to Insecticides in Puerto Rico

Abstract

80% at 96 h) to Steinernema carpocapsae (Weiser) (Nematoda: Steinernematidae) + oil and to methomyl, respectively, whereas both species were susceptible to chlorpyrifos. The LC50 values for chlorpyrifos was 248 ppm, whereas 312,500 S. carpocapsae nematodes per L + 625 ppm of rapeseed oil caused 53% of larval mortality at 120 h post-treatment for corn earworm larvae.