Abstract
Several cultural and chemical control methods were evaluated for reducing population levels of the plant bugs Adelphocoris lineolatus (Goeze), Lygus Lineolaris (Palisot de Beauvois), and Plagiognathus chrysanthemi (Wolff) in birdsfoot trefoil ( Lotus corniculatus L.) grown in northern Wisconsin. In insecticide efficacy trials, all insecticides (malathion, dimethoate, trichlorfon, and fluvalinate) significantly reduced populations of plant bugs. Fluvalinate was slightly less effective than the other insecticides, particularly against L. Lineolaris . Insecticides applied in June provided a longer period of control (before adult plant bugs dispersed into the sprayed areas) than did applications made in July. Spring burning of the previous fall’s trefoil regrowth also significantly reduced populations of plant bugs but was slightly less effective than insecticide applications. Removal of plant material following seed harvest during late summer did not provide significant control of plant bugs for the following year.
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