Most of the damage that this pest causes is done in the early spring; this is when the larvae are near the surface of the soil. The larvae will feed on the germinating seeds of cereal and potato crops or seedlings. They will also tunnel through the plant which could potentially kill it or cause disease. The color of the wireworm varies, but they are usually yellow or white. The distinguishing feature is the pincher on the tail end of the wireworm.
Adult wireworms, called click beetles, generally overwinter in the soil and will come out later in April and early May; when the temperature gets close to 10 degrees. The females will then lay their eggs and the larvae will hatch about 3-8 weeks later. This is when the larvae will start terrorizing your crops.
Wireworms, larvae stage, live in the soil for many years and can survive adverse conditions. Wireworm stage lasts anywhere from 4-11 years, depending on food availability. They will hibernate in the soil 5-25cm belong ground level. Once fully grown, which is usually July, the larvae will pupate. Adults however, don’t emerge until the next spring. The females can lay between 200-400 eggs between late May and Early June and then the life cycle begins again.
From Ashley Fitzpatrick, Crop Scout with McRae Holdings