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PARTICLE SIZE OF DDT WETTABLE POWDERS IN RELATION TO TOXICITY*

Published online by Cambridge University Press:  31 May 2012

G. G. Dustan  and
W. L. Putman
G. G. Dustan
Affiliation:
Dominion Fruit Insects Laboratory, Vineland Station, Ontario
W. L. Putman
Affiliation:
Dominion Fruit Insects Laboratory, Vineland Station, Ontario
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Extract

It is generally considered that the smaller the particle size of insecticides applied as solids, the greater is their effectiveness. Smith and Goodhue (1) arrived at his conclusion after a review of the literature. Woodruff and Turner (4) showed that decrease in particle size of DDT wettable powders increased the toxicity of the residues against house flies, and that correspondingly better results were obtained from the residues of smallest particle size in a field test against potato leafhopper and fleabeetles. Steiner et al. (2), who have done much work on the effect of DDT particle size on codling moth control, stated that for this purpose the optimum surface mean particle diameter for DDT lies between 2.5 and 5 microns.

Type
Articles
Information
The Canadian Entomologist , Volume 79 , Issue 11-12 , December 1947 , pp. 216 - 221
Copyright
Copyright © Entomological Society of Canada 1947

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References

REFERENCES

1.Smith, C. M., and Goodhue, L. D.. 1942. Particle size in relation to insecticide efficiency. Ind. and Eng. Chem. 34: 490–93.CrossRefGoogle Scholar
2.Steiner, L. F., Summerland, S. A., McAlister, H. J. and Fahey, J. E.. 1947. DDT for control of the codling moth in the middle west. Trans. Indiana Hort. Soc. 86: 83–97.Google Scholar
3.Weisser, J., and Gooden, E. L.. 1947. Particle-size reduction of DDT in grinding with diluents. Agr. Chem. 2: 28–29.Google Scholar
4.Woodruff, Nancy, and Turner, Neely. 1947. The effect of particle size on the toxicity of DDT diluents in water suspension. Jour. Econ. Ent. 40: 206–211.CrossRefGoogle ScholarPubMed