Abstract
Because of a general failure of heptachlor treatments to control the alfalfa weevil, Hypera postica (Gyllenhal), in eastern Virginia, laboratory tests were conducted to determine if heptachlor resistance had developed in this pest. Larvae, pupae, and/or adult alfalfa weevils were collected from several counties in Virginia. They were maintained in the insectary until they were 30-day old adults. Individual adults were treated topically with measured drops of heptachlor, or dieldrin, solutions in acetone. The resulting dosage-mortality data indicate that weevils from several counties east of the Allegheny Mountains are resistant to heptachlor, with considerable cross resistance to dieldrin. There was no evidence that weevil from the higher elevations of Virginia had developed heptachlor resistance.
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