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Cutworms in Gardens

Source: NDSU Extension Service Horticulturist

Cutworms are a common early-season insect problem in flower and vegetable gardens. One of the most common cutworms encountered is the variegated cutworm which is dark-tan in coloration. It has a series of white teardrop markings down the middle of the back. These markings are a no-fail method of identifying the variegated cutworm.

The variegated cutworm, like other cutworm species, feeds primarily during the evening and rests in the upper few inches of soil around recently damaged plants during the daytime. Because of this habit, cutworms and the damage they cause will often go undetected until considerable plant injury has occurred.

When garden plants are found cut off at ground level or just below ground level or if there is considerable leaf damage but no insects are evident, this should serve as a clue for homeowners to check the soil around the base of recently damaged plants. If cutworms are present, they will normally be within the upper 1-3 inches of soil around the base of recently damaged plants. Often the cutworms will be found in a C-shaped position. They will range from to 1 inches in length.

Sevin insecticide is registered for cutworm control in both flower and vegetable gardens. Several formulations are available including dusts, wettable powders, liquid and pelleted bait. As with any pesticide, use Sevin according to label directions.

For an organic method of control, sprinkle diatomaceous earth around transplants you want to protect. This fine, fossilized shell material has microscopic sharp edges that pierce soft bodies and causes them to dehydrate. Apply after a light rain for better effectiveness.

If your garden has adequate moisture the Sevin bait will probably provide the best degree of control because the cutworms are attracted away from the plants to the bait to feed. With the other formulations of Sevin, the cutworms may continue to do a certain amount of feeding before they acquire enough insecticide to provide control.

For future reference, you may want to obtain a copy of Extension bulletin E-331, "Garden Insect Control Guide," which is available at your county office of the NDSU Extension Service.

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