Systemic insecticidal action of certain phosphates in Pinus strobus against Diprion similis.
Previous studies [cf. F.A. 22 Nos. 2158, 3318] showed that phosphate or phosphorothiolate molecules were associated with the highest insect mortality, the longest residual action throughout the tree, and the only practical control of bark feeding. Further work reported here indicates that implantation with Shell 3562, Shell 1836 (O, O-diethyl 2-chlorovinyl phosphate) or phosphamidon (at 4, 5 or 8 g. actual substance per tree) should effect control for 2-3 years without producing phytotoxic symptoms in trees. KEYWORDS: Injection \ chemicals into trees \ insect pests \ insect pests \ Hymenoptera \ Insecticides 'Shell 1836' \ Insecticides 'Shell 3562' \ Insecticides application injection \ Insecticides phosphamidon \ systemic insecticides \ insecticides \ Pinus strobus \ insect pests \ protection \ forests