Bug Scout 1979
Check for Cornborers
(Tom Turpin, Entomologist, Purdue University)
So much for the demonstration of shot-hole damage!
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June 16, 1979

It's time to look for damage caused by European cornborer.  Newly-hatched borers feed on corn leaves.  This feeding results in shot-hole damage.  Look for shot holes as an indication of the need for control.  

Control may be justified when 50% of the plants show shot-hole feeding and live borers are present in the whorl.  Insecticides will not provide adequate control if borers have entered the stalk, so timeliness of application is important.

Insecticides applied at planting time will not work!  Don't assume a field is safe from cornborer because a soil insecticide was used.

Fields with plants 30 in. or more in extended leaf height are more attractive to moths.  Scout these fields first.

May all of the borers you find be little ones!

by Tom Turpin, Entomologist, Purdue University

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