Abstract
Fourteen commercial and four experimental formulations of insecticides, when applied to loblolly pine, Pinus taeda L., foliage in a simulated high volume spray, varied in their residual contact toxicities to adult leaffooted pine seed bugs, Leptoglossus corculus (Say). Deltamethrin emulsifiable concentrate (EC), the most toxic insecticide tested, was 7 times as toxic to adult females as the standard, azinphosmethyl EC. Azinphosmethyl wettable powder (WP) was slightly more toxic to females than the EC at LC90; all other insecticides were less toxic than azinphosmethyl EC to females (half or less). Azinphosmethyl EC, deltamethrin EC, permethrin (Pounce) EC, and phosmet WP were equally toxic to both sexes, while permethrin (Ambush) EC and fenvalerate EC were both more toxic to males than females. Azinphosmethyl WP was more toxic to females than males. Several of the insecticides, including propoxur WP, malathion EC and chlorpyrifos EC, had relatively low residual contact toxicities but were very toxic to seed bug adults as fumigants. The pyrethroids permethrin, deltamethrin and fenvalerate had a relatively rapid knockdown effect, in contrast to the slower-acting organophosphorous insecticides.
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