Bug Scout 1978
Count Rootworm Beetles
(Tom Turpin, Entomologist, Purdue University)
Did ya count that one, Bug Scout?
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August 5, 1978

Count beetles now to help determine the need for rootworm control on next year's corn crop. Beetles present during August lay eggs that hatch into rootworm larvae next spring. An average of one beetle per plant is needed before the use of a soil insecticide is profitable.

Count the beetles on a minimum of 25 plants, five plants at each of five locations per field. Be sure to look behind leaf sheaths and in silks. For the best results, select plants that are typical of the crop and avoid sampling only in the border areas of your field.

Fields that do not have beetle populations and are in brown silk normally do not need further scouting. However, fields in green silk will attract beetles from neighboring fields and might require additional field visits.

A visit to a cornfield in August may not be a pleasure trip. But many corn farmers have found that it's a management tool that pays dividends.

by Tom Turpin, Entomologist, Purdue University

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