Keep an eye out for cutworms on young tomato plants, asparagus, beans, cabbage, carrots, celery, corn, lettuce, peas, peppers, and potatoes. A few species do feed on turfgrass. Cutworms can damage lawns, too, but they prefer eating through huge swaths of manicured grass such as what you’d find at a golf range.
Are Cutworms Harmful to Gardens?
Black, bronzed, and army cutworms feed at night and hide in plant debris during the day. They can cause severe injuries to the vegetable plants mentioned above and to well-cared-for lawns. Meanwhile, the variegated cutworm climbs the stems of trees, shrubs, and vines, eating leaves, buds, and fruit. Glassy cutworms are one of several species that can stay in the soil and feed on the roots of new transplants and young plants, which they are fond of because the stems of these plants are more tender. Therefore, the damage is usually most serious in the early season, cutworms being most active in spring though still active in summer. Though cutworms are never consistent year to year, the higher the number, the more damage they will do to your plants.
Identification
Many people confuse cutworms and grubs because they tend to look somewhat similar with smooth, hairless bodies. Both insects also curl into a “C” shape when they are exposed. But you can tell cutworms apart from white grubs mostly because of their coloring and markings. Most cutworms are black, but they also present as brown, tan, pink, green, or gray. Some cutworms have spotted or striped patterns with either a dull or shiny coating.
How to Get Rid of Cutworms
When you find cutworms, don’t delay in removing and protecting plants so the pests can’t harm them further. Use these simple steps:
Prevention
Till your garden in autumn to kill any larvae or pupae in the soil. In the mornings, check plants while the damage would be fresh. Keep an eye out for plant remnants on the ground near their stems, plants cut off near the ground, or wilted plants, which are all signs of cutworm feedings. Confirm their presence by using a trowel to overturn any clumpy soil near the damaged plants. Exposed cutworms will curl into a “C.” Some plants, such as tomatoes, peppers, and celery, will need to be checked regularly for cutworms from the time they’re seedlings to maturity and harvest. Use beneficial nematodes in the garden since they will feed on cutworms and prevent their presence as well as other harmful insects.
