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Bidrin® (3-hydroxy- N, N -dimethyl- cis -crotonamide dimethyl phosphate). Azodrin® (3-hydroxy- N -methyl- cis -crotonarnide dimethyl phosphate), methyl demeton, and dimethoate at concentrations of 0.5 to 8.0% by weight moved readily from foliage into cones of Douglas-fir. Pseudotsuga menziesii Mirb. Franco. Using the ratio of dead to living cone midges, Contarinia oregonesis Foote, it was shown that no effective translocation occurred from one side of the cone to the other or from the tip of the cone to the base. There was fair translocation from the base into the tip. Phytotoxicity of both cones and foliage increased with insecticide concentration. One-half to 1.0% concentrations applied so as to cover the foliage thoroughly is recommended for control of insects affecting Douglas-fir cones.

Oxydemetonmethyl and Bidrin® (3-hydroxy- N, N -dimethyl- cis -crotonamide dimethyl phosphate) were sprayed on the leading shoots of young Sitka spruce, Picea sitchensis (Bong.) Carr., to determine their effects on Sitka-spruce weevil, Pissodes sitchensis Hopkins. Spring applications made after egg laying, but before the larvae caused appreciable damage, provided good control. Exploratory tests were made also with injected applications of oxydemetonmethyl, Bidrin, demeton, and schradan. Because of limited replication the results of the injection tests can be regarded only as tentative, but both oxydemetonmethyl and Bidrin appeared to provide a good measure of control.