Synergism of Insecticides in Tests with Resistant Soybean Looper Larvae (Lepidoptera: Noctuidae) in the Laboratory and Field
Authors: THOMAS, JAMES D.; BOETHEL, DAVID J.
Source: Journal of Economic Entomology, Volume 87, Number 6, December 1994 , pp. 1416-1422(7)
Publisher: Entomological Society of America
Abstract:The F1 generation of several field-collected strains of soybean looper larvae, Pseudoplusia includens (Walker), were tested for synergism of permethrin by piperonyl butoxide (PB) and S,S,S tributylphosphorotrithioate (DEF) in 1992. The synergism of permethrin and methomyl by PB was tested in 1993. Permethrin was completely synergized by 10 µg PB per larva in strains from Louisiana; these strains were 2.7-14.1-fold resistant. Permethrin toxicity was increased 8.6-fold by 10 µg PB per larva in a strain from Texas, which was 14.8-fold resistant. Toxicity was increased only 4.6- and 7.5-fold by 10 and 20 g µPB per larva, respectively, in a Puerto Rico strain; this strain had the highest reported level of permethrin resistance (426.6-fold). We observed no significant synergism of permethrin in any of the strains tested with DEF. Methomyl was synergized to a lesser degree than permethrin by PB in a strain from Louisiana. Field trials were conducted in 1992 and 1993 in soybean in Louisiana with 0.11 kg AI/ha permethrin and several rates of PB. Soybean looper control with permethrin + 1.12 kg Al/ha PB was comparable to that achieved with the current recommended standard insecticide, thiodicarb, at 0.50 kg(AI)/ha, and significantly greater than that achieved with permethrin alone.
Document Type: Research article
Publication date: 1994-12-01
- 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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