Effect of Particle Size of Some Insecticides on Their Toxicity to the Codling Moth Larva*

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Abstract
The effect of particle size on the toxicity of 5 insecticides to the codling moth larva is reported. 3 fractions each. graded as to particle size into fine, medium and coarse, of Ca arsenate, Paris green, cryolite (synthetic) and phenothiazine, and 2 fractions of acid lead arsenate were tested in replicated series. Except for phenothiazine, no great difference in toxicity of the different fractions was obtained, but the medium fraction was generally slightly superior. The coarse fraction of Pb arsenate was somewhat more effective than the fine (no medium fraction was prepared). The coarse fraction of phenothiazine was much less toxic than the fine or medium fraction.

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