Effect of an Experimental Field Application of DDT Dust on Nomia melanderi1

Abstract
3% DDT dust 20 lbs. per acre was applied in the early morning to 16 acres of alfalfa in bloom near Delta, Utah, to test the effect of the insecticide on a population of Nomia bees. More than 50% of the female bees in the nesting site studied visited the alfalfa on the day it was dusted. The application was moderately repellent to the bees for a few hrs. More than 2% of the females nesting in sample areas were found dead at their nest entrances after the dusting, and about 15% of the nests in the same areas became inactive, apparently as a result of the treatment.

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