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Soil Properties Affecting Dieldrin Toxicity to Drosophila melanogaster¹

ABSTRACT

The toxicity to Drosophila melanogaster Meigen of dieldrintreated soils was measured by bioassay. Under adequate standardization and control of light, temperature, humidity, and soil moisture, the variation in insecticidal activity was closely related to the colloidal properties of the soils. As organic carbon content, specific surface area of the minerals, and soil reaction increase, higher levels of dieldrin were required to maintain the killing power. Cation-exchange capacity interacts with soil organic carbon content to increase dieldrin effectiveness. The dieldrin activity equation developed shows that often the simplest practical mathematic model of soil pesticide activity should be quadratic.

¹ Idaho Agricultural Experiment Station Research Paper no 685.

² Formerly Assistant Agricultural Chemist, Idaho Agr. Exp. Sta., now Assistant Research Entomologist, Citrus Research Center, Riverside, Calif.; and Assistant Professor of Zoology, Univ. of Idaho, Moscow, respectively.

Received for publication April 4, 1966. Accepted for publication August 18, 1966.