Bug Scout 1980
Several Factors Affect Insecticide Performance
(Tom Turpin, Entomologist, Purdue University)
I knew running combines at night would get the moths all stirred up!
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October 4, 1980

Remember the old football cheer that begins, "Lean to the left, lean to the right"?  That might be a good way to describe some Indiana cornfields this fall.  Cornstalks leaning because of poor roots could be damaged by corn rootworm.  Rootworms sometimes show up in fields treated with a soil insecticide.  Poor insecticide performance can be due to several factors:

(1) Soil moisture conditions influence insecticide performance.  Some products perform most poorly under wet conditions, others under dry.

(2) Planting date influences the time products have to persist in the soil.  Generally products perform more poorly when applied to some early-planted corn.

(3) Some classes of insecticides perform more poorly than other classes.

(4) Rate of application, if less than recommended, cannot be expected to provide acceptable control.  Make sure amount of product corresponds to row width.

(5) Method of application is very important to control.  For instance, band applications provide better control than in-furrow applications.

If cornstalks in some of your fields have more curves than a mountain road, it might be time to evaluate your rootworm control program.

by Tom Turpin, Entomologist, Purdue University

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