University of Illinois Extension
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Picnic Beetles - Sweet Corn


The sap beetles fly to ripening or damaged apples, strawberries, raspberries, watermelons, muskmelons, corn, tomatoes, etc. The beetles bore into the fruit and makes it unfit for human consumption. The picnic beetle tends to attack damaged and overripe or decomposing plant tissues. It attacks undamaged ear corn silks and ripe fruits. They tend to congregate in areas where fruit and vegetable materials are present.


Harvest the fruits as soon as they ripen, and remove any damaged or overripe fruits & vegetables from field. Use of traps/baits with scents of overripe fruits, and discard the traps as soon as they are filled with the picnic beetles. Spray with insecticides (recommended in your state) but observe the pre-harvest interval.


picnic beetle