NDSU Extension - Morton County

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August 24, 2020 Flea Beetles in the Garden

Flea Beetles in the Garden

Many gardeners are seeing the little black insects on their spinach, cabbage, broccoli, and other garden vegetables. Flea beetles are active in our gardens right now.  Most adult beetles are very small about 1/16th -1/8th inch long. Most of the damage caused by flea beetles are seen on the leaves and stems, which are small round, irregular shaped holes.

Managing flea beetles in the garden is similar to managing most pesky insects.  Control weeds in and around the garden.  Remove any plant debris at the end of the season to prevent overwintering and winter protection.

Many pesticides are available for control.  If you have 10-30% defoliation, you may consider spraying spinosad, carbaryl, or pyrethrin.  Always follow the label for directions when using a pesticide.

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