Relative Susceptibility of Larvae of Six Species of Trogoderma to Ten Organophosphorus Insecticides

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The relative susceptibility of Trogoderma glabrum (Herbst), T. grassmani Beal, T. inclusum LeConte, T. simplex Jayne, T. sternale Jayne, and T. variabile Ballion (= T. parabile Beal) to 10 organophosphorus insecticides was determined by direct application of spray solutions to mature larvae. Various degrees of differences in susceptibility were observed among species, and the range of differences varied with insecticides.

The magnitude of differences in susceptibility between the most susceptible and least susceptible species of Trogoderma to each insecticide at LC50 was: C-9491 (O- (2,5- dichloro-4-iodophenyl) O,O-dimethyl phosphorothioate), simplex:variabile, 34.9; diazinon, simplex:inclusum, 4.8; dicapthon, glabrum: grassmani, 5.6; dichlorvos, grassmani:simplex, 2.5; Dursban® (O.O-diethyl O-(3,5,6-trichloro- 2-pyridyl) phosphorothioate), grassmani:variabile, 5.4; fenitrothion (O,O-dimethyl O-4-nitro-m-tolyl phosphorothioate), simplex:variabile, 34.4; fenthion, simplex:variabile, 8.3; Gardona® (2-chloro-1-(2,4,5-trichlorophenyl) vinyl dimethyl phosphate), grassmani:variabile, 6.1; malathion, simplex:variabile, 21.3; and phoxim, grassmani:inclusum, 1.7. The response of T. inclusum to C-9491 was similar to that of T. variabile.

The order and rank in relative effectiveness of insecticides indicated by ratios calculated from LC95 values obtained for the least susceptible of the 6 species of Trogoderma to each of the compounds tested were: phoxim 1.0; dichlorvos 1.5; dicapthon 2.0; Gardona 2.7; fenthion 2.7; Dursban 5.4; fenitrothion 6.1; diazinon 7.0; malathion 24.1; and C-9491 48.9. However, when results with T. variabile are execpted, fenitrothion was the most effective compound tested against all of the other species; followed by fenthion against T. glabrum, T. grassmani, and T. simplex; Gardona against T. inclusum; and phoxim against T. sternale.

Document Type: Research Article

Publication date: December 15, 1970

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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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