Bug Scout 1979
Rootworms Cause Some Lodging
(Tom Turpin, Entomologist, Purdue University)
The corn row is over here, I think!
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October 20, 1979

It's harvest time!  Many farmers will find cornfields where the stalks are not standing upright.  These lodged stalks are frequently blamed on damage caused by rootworm larvae.  While rootworm damage does cause lodged corn, it is not the only factor involved.

Lodged corn can be caused by root rot, wind, rain, or poor root systems due to growing conditions or varietal differences.  Research has shown that only about 30% of the lodging in cornfields in Indiana is due to rootworm damage.

Remember that lodging is not a good indicator of the level of rootworm control provided by a soil insecticide.  However, lodged corn should be investigated to determine the cause.  If it is rootworm damage, better control measures might be profitable for you to consider.

by Tom Turpin, Entomologist, Purdue University

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