Development of the Entomogenous Nematode, Neoaplectana carpocapsae (Rhabditida: Steinernematidae), in Insecticide-Killed Beet Armyworm (Lepidoptera: Noctuidae)12

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Abstract
The entomogenous nematode Neoaplectana carpocapsae Weiser invaded and reproduced in larvae of Spodoplera exigua (Hübner)killed by the insecticides trichlorfon, mevinphos, methomyl, fenvalerate, and permethrin. When killed S. exigua were exposed to infective juveniles of N. carpocapsae 48 h after insecticide treatment, 72% to 100% of dead S. exigua produced nematode progeny. The nematode progeny were infectious to living S. exigua . However, when S. exigua was first infected with N. carpocapsae and 48 h later topically treated with phenamiphos or methomyl, development and reproduction of N. carpocapsae were adversely affected.