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Synergism of Carbamate Insecticides Against Cabbage Looper and Beet Armyworm Larvae1

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Piperonyl butoxide and Monsanto 16226 (bis (2,3,3,3-tetra- chloropropyl) ether) were tested as synergists in combination with Sevin® (1-naphthyl N-methylcarbamate), Hercules 5727 (m-iso-propylphenyl N-methylcarbamate) and Zectran® (4-dimethylamino- 8,5-xylyl N-methylearbamate). In 1: 1 mixtures with piperonyl butoxide, tested against larvae of the cabbage looper, Trichoplusia ni(Hübner), Sevin was potentiated 10.3-fold, Hercules 5727, 2.6-fold, and Zedran, not at all. Against larvae of the beet armyworm, Spodoptera exigua (Hübner), Sevin and Zeetran were potentiated 4.4-fold and 1.2-fold, respectively. An increase in the ratio of piperonyl butoxide to carbamate gencrally provided a corresponding increase of potentiation against the cabbage looper. Monsanto 16226, with a relatively high innate toxicity against both species, was not considered as efficient a synergist as piperonyl butoxide.

Document Type: Research Article

Publication date: December 1, 1961

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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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