Bug Scout 1982
Planting Timelines Affects Rootworm Control
(Tom Turpin, Entomologist, Purdue University)
Ol' Joe will go to any length to be the first in the county to plant corn!
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April 17, 1982

On the average, corn in Indiana is planted earlier than it was a few years ago.  For instance, from 1967 through 1971 about 7% of the corn acreage was planted prior to April 30.  From 1973 through 1977, 12% of the corn acreage was planted by that date.

Earlier planting means more pressure on rootworm insecticides applied at planting.  Rootworms don't hatch sooner in early-planted cornfields, so the insecticide must remain in the soil longer before control is needed.  Early planting also favors survival of rootworm larvae so there are more rootworms to kill.  This adds up to more performance problems for planting rootworm insecticides.

If rootworm control is a problem on early-planted corn, consider the following.  Plant corn following soybeans first because rootworms are not likely to be a problem.  Apply insecticides at cultivation instead of at planting on early corn.

They say that the early bird catches to worm.  It's also true that the early corn catches the rootworms!

by Tom Turpin, Entomologist, Purdue University

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