Abstract
Of several systemic insecticides tested for their effectiveness in controlling the clearwinged cottonwood leaf aphid, Chaitophorus populellus Gillette and Palmer, Meta-Systox- R® (S-2- (ethylsulfinyl) ethyl O,O -dimethyl phosphorothioate) appeared to be the most effective material tested, when injected into the tree both through the root and trunk. Bayer 39007 ( o -isopropoxyphenyl methylcarbamate) and dimethoate, when mixed with 5 gal of water and applied as a soil drench, exhibited marked toxicity to the grass surrounding the trees, but Meta-Systox-R, fenthion, and Nellite (phenyl N,N -dimethylphosphorodiamidate) did not. Use of Mauget Implant Injectors® proved to be a much simpler, cleaner, and less hazardous method of treating trees than either soil drenches or root injection with hypodermic syringes.
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