We tested the pyrethroid insecticide esfenvalerate in single, double, and triple applications for control of insects affecting seed production of blister rust-resistant western white pine, Pinus monticola
Douglas. All treatments increased the proportion of normal seed produced and reduced the proportion of seed damaged by the western conifer seed bug, Leptoglossus occidentalis
Heidemann. Only the triple application reduced the proportion of cones killed by the pine cone beetle, Conophthorus ponderosae
Hopkins. Other seed-damaging insect species [seed chalcids, Megastigmus
sp.; the fir conewonn, Dioryctria abietivorella
(Grote); and seedworms, Cydia
sp.] were present but in numbers too low to test for insecticide efficacy.
Rappaport, N.G.; Haverty, M.I.; Shea, P.J.; Sandquist, R.E. 1994. Efficacy of esfenvalerate for control of insects harmful to seed production in disease-resistant western white pines. Can. Entomol. 126: 1-5.