Date: 3/30/99

Time: 4:45

Type: Symposium

Number: 176

FQPA - Impact on crucifers

*R. Foster, Department of Entomology, Purdue University, W. Lafayette, IN 47907
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Loss of the organophosphate and carbamate insecticides would have a minimal impact on production of crucifers. The caterpillar complex consisting of diamondback moth, imported cabbageworm, and cabbage looper is the primary pest problem on crucifers and can be controlled quite well without either organophosphates or carbamates. Flea beetles are often controlled with carbaryl, but can be controlled as well or better with pyrethroids. Aphids could still be controlled with imidacloprid or endosulfan. Thrips are best controlled with pyrethroids. The most problematic of the pests would be the root and seed maggots, for which chlorpyrifos, diazinon, and fonophos (which has been discontinued). There are no other insecticides registered that will provide acceptable control. Root and seed maggots, while not major pests, can be quite serious in some situations. Use of planting timing applications of organophosphates on crucifers results in little or no detectable residues in the harvested product, so the chances of retaining these registrations should be relatively good.

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