Avermectin B1: Ingestion and Contact Toxicity Against Spodoptera eridania and Heliothis virescens (Lepidoptera: Noctuidae) and Potentiation by Oil and Piperonyl Butoxide

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Toxicities of Avermectin B1 (AVB) were examined in tests with Spodoptera eridania (Cramer) and Heliothis virescens (F.). In assays in which larvae ingested treated foliage, S. eridania was 4-fold more sensitive to fenvalerate than to AVB. In contrast, H. virescens was 26-fold more susceptible to AVB than to fenvalerate. In topical application tests, H. virescens was equally susceptible to AVB and fenvalerate, whereas S. eridania was 990-fold more sensitive to fenvalerate than to AVB. In foliar ingestion assays, piperonyl butoxide (PB) produced significant potentiation in combination with fenvalerate but not with AVB. In topical application tests with S. eridania, greater toxicity was seen when AVB and PB were applied together than when PB was applied 2 h before AVB. Combinations of AVB and an emulsifiable spray oil produced a greater degree of potentiation than that by PB. The susceptibility of H. virescens to topical applications of AVB was not significantly increased by PB or oil.

Document Type: Research Article

Publication date: February 1, 1986

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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