Wireworms
HOSTS
- Asparagus
- Brassicas
- Corn
- Cucurbits
- Leafy Greens
- Legumes
- Potato
- Root Crops
- Sweet Potato
DESCRIPTION
Adults are known as click beetles (a hinge-like mechanism between the thorax and abdomen creates a clicking noise) with a black to brown hard-shell body.
Larvae are wiry with a light brown, slightly hard, elongate body.
BIOLOGY
Egg | Larva | Pupa | Adult
Click beetles are present throughout the season. The number of generations vary. Adults overwinter in the soil.
- Adults emerge in late April to early May in northern Utah.
- Inspect the soil surface for wireworms after plowing or disking fields.
- Baits (carrots, untreated corn or wheat seed, ground whole wheat four) can be used to detect wireworm larvae. Place two bait stations per acre, 4-6 inches deep in the soil, when soil temperatures are at 50°F and check for wireworms just prior to planting.
SYMPTOMS
Larvae tunnel through germinating seeds, roots, and other below ground plant parts. Tunneling degrades the quality of root crops and seedlings may be killed.
GENERAL MANAGEMENT
Wireworm injury is uncommon, but there have been a few problems in Utah. Once present in a field, wireworms can be difficult to eradicate.
- Crop rotation.
- Remove dead plants and tubers throughout the season and at harvest.
- Maintain healthy soils.
Precautionary Statement: Utah State University and its employees are not responsible for the use, misuse, or damage caused by application or misapplication of products or information mentioned in this document. All pesticides are labeled with ingredients, instructions, and risks, and not all are registered for edible crops. “Restricted use” pesticides may only be applied by a licensed applicator. The pesticide applicator is legally responsible for proper use. USU makes no endorsement of the products listed in this publication.