Lethal Residues of Seven Insecticides for Control of Tarnished Plant Bug Determined by Four Methods

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Dimethoate was the best of 7 insecticides evaluated for control of Lygus lineolaris (Palisot de Beauvois) in apple orchards. The 4 methods employed for evaluation were consistent in ranking relative toxicities. The method that permitted contact with the deposit on an excised leaf was most practical for determining amounts of deposit needed for adequate control.

Results were expressed in lethal concentrations (LC50 and LC95 g (AI/liter) and lethal residues (LR50, and LR95, g/cm). With the direct spray method, LC95 values were 13.2, 5.3, 3.9, 1.2, 0.73, O.11, and 0.056 g (AI)/liter for DDT, phosalone, endosulfan, phosmet, tetrachlorvinphos, fenitrothion, and dimethoate, respectively. With the excised leaf method, LR95 values were 7.7, 5.7, 5.5, 0.77, 0.28, and 0.0085 g/cm2 for DDT, endosulfan, phosmet, tetrachlorvinphos, dimethoate, and fenitrothion. respectively. DDT, the only insecticide recommended for control of the tarnished plant bug in Ontario until 1972, was found to be the least toxic of the insecticides tested.

Document Type: Research Article

Publication date: April 1, 1978

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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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