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- W1987657963 abstract "The conditions required in an inert dust for it to become an effective insecticide against grain weevils have been investigated. Particle size and intrinsic hardness are important, but not the only, factors. In the case of carborundum, particles larger than 15μ are without action, probably because they do not adhere to insects, and effectiveness increases as the size is reduced from 10μ to about 2μ where a maximum effectiveness is reached. The effectiveness of a large number of different substances has been tested by a simple method which eliminates complications arising from particle size differences, and the results show a rough correlation of effectiveness with hardness. In general, materials softer than calcite are ineffective, and effectiveness increases with hardness, but the method of preparation of dusts is also important. Some dry-ground powders are inferior to those wet-ground, a phenomenon which appears to be due to some kind of surface change—possibly the formation of a Beilby polish layer. The effectiveness of some dusts can also be considerably altered by superficial chemical treatment. A theory is proposed, based on an experiment with an artificial membrane system, to explain the mechanism by which dusts promote evaporation of water from insects. It is suggested that clean crystalline surfaces of effective dusts can absorb, or in some way penetrate, the water-resistant epicuticle." @default.
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- W1987657963 date "1944-05-01" @default.
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- W1987657963 title "Inert dust insecticides: Part II. The nature of effective dusts" @default.
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- W1987657963 doi "https://doi.org/10.1111/j.1744-7348.1944.tb06226.x" @default.
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