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Picnic
Beetles (sap beetles) are secondary invaders. Usually they are attracted to ear
tips damaged as a result of corn earworm feeding. However, the beetles may enter
undamaged ears anytime from early silk to maturity.
Sap beetles are about 3/16 to 1/4 inch long and
brown to black. There may be orange markings on the wing covers. Larvae may be
found in some ear tips along with adults.
These pests are difficult to control because even
if large numbers are killed, more are likely to come in from untreated areas.
Insecticides used to control corn earworms should be a relatively good job of
reducing sap beetle problems.
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