Additional Studies on the Effect of Field Applications of Insecticides on Honey Bees

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Abstract
Sixteen tests were conducted. Applications were made to seed alfalfa in bloom near Logan, Utah, before 7 a. m. or after 7 p. m. The effect of each application on the field force of a small apiary placed at the edge of the field was measured by counting the dead bees at the hives and in the treated acreage. On the basis of 10% mortality as the limit for sanction, the following treatments are considered as too toxic to honey bees: early morning sprays of TEPP 6 oz., malathion 10 oz., dieldrin 1 oz., heptachlor 4 oz., aldrin 2 oz., chlordan 1 lb., and endrin 4 oz., and in early morning dust of DDT 0.5 lb. per acre. Treatments in addition to Toxaphene classified as safe include morning sprays of DDT 0.5 lb. and Systox 6 oz., and an evening spray of TEPP 6 oz. per acre.

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