Abstract
Starting in 1963 adults of the western corn rootworm, Diabrotica virgifera Le Conte, were collected annually from 18 sites in Nebraska and treated to determine LD30 levels for diazinon and phorate. Dosage-mortality curves and LD30 values are presented for both insecticides for 1963 through 1967. The LD30 values for both diazinon and phorate have increased significantly since 1963. Control of the western corn rootworm with both insecticides remains effective, but the increasing LD30 values should alert entomologists to possible failures in the field.
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