Bug Scout 1982
Check for Cornborer Damage
(Tom Turpin, Entomologist, Purdue University)
Do you get the feeling that our high-clearance rig is not quite high clearance enough?
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August 21, 1982

Cornborer populations very greatly from year to year.  In 1982 the first-brood population was very low.  First-brood moths fly in June.

Second-brood moths lay eggs during August.  These moths prefer to lay eggs on corn in fresh silk.  Late-planted fields are especially susceptible.  Treatment is suggested if 50% of the corn plants have live larvae.

Sprays for cornborer control depend on getting insecticide into the whorl.  They should be applied at low pressure and directed to the leaf sheath area.

If second-brood cornborers become a problem, early harvest of the infested field is recommended.  This is because primary damage is due to broken stalks and dropped ears.

Also, just because cornborer populations are down this year doesn't mean they'll be low next year.  Like a bad nickel, cornborers will always come back.  

by Tom Turpin, Entomologist, Purdue University

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