Abstract
Granules of phorate and Di-Syston® ( O,O -diethyl S -[2-(ethylthio) ethyl] phosphorodithioate) were applied to the soil around small red pine trees for the control of the European pine shoot moth, Rhyacionia buoliana (Schiffermuller). Spring applications of 0.24 to 1.2 ounces of phorate and 0.15 to 1.2 ounces of Di-Syston per tree were effective in controlling the shoot moths as interpreted by counts of the overwintering larvae of the next generation. Summer counts made 1 to 3.5 months after the insecticide application did not show a large or consistent reduction, but Summer counts made 16.5 months after phorate applications showed that phorate at 0.6 ounce per tree was still effective. Phorate was superior to Di-Syston in all tests.
Published Version
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