Bug Scout 1981
Treatment First-Year Corn for Rootworms Questionable
(Tom Turpin, Entomologist, Purdue University)
Should he treat first-year corn with insecticide?
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March 21, 1981

Should you treat first-year corn with a soil insecticide?  In Indiana, only five out of 100 insecticide treatments on first-year corn will make money.  The reason is that most first-year corn doesn't have an economic infestation of soil insects or nematodes.

Corn rootworms occasionally damage corn following soybeans.  This happens because the soybeans had volunteer corn or weeds the previous year which attracted rootworm beetles.  Cutworms can be a problem on first-year corn following beans.  However, cutworms are more efficiently controlled with postemergence applications of insecticides to prevent losses from stand-reducing insects.

Treating corn following soybeans with soil insecticides is not likely to return a profit unless you are in the business of selling insecticides.

by Tom Turpin, Entomologist, Purdue University

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