Agriotes mancus

Agriotes mancus, commonly known as the wheat wireworm, is a species of click beetle in the family Elateridae. It is native to north-eastern and north-central North America, with most records from eastern Canada (e.g. Quebec and Ontario) and the north-eastern US (e.g. New York, Pennsylvania, Maine). In the West its distribution extends up to the US states of Missouri and Minnesota as well as to the Canadian province of Manitoba. The larvae (wireworms) are a significant agricultural pest, attacking the roots, tubers and seeds of cereals, potatoes and other crops. For example, large-scale outbreaks have been reported from maize (corn) and potatoes, especially if these crops are planted after or close to grassland, the natural habitat of this insect. Such outbreaks can cause complete crop failures, for example in maize by the wireworms feeding on the seeds and the roots of the seedlings. However, in north-eastern North America, the economic importance of A. mancus appears to have declined in the 20th century in some areas, possibly due to competition with the introduced species Agriotes sputator. The adult beetles are between 6.5 and 8.5 mm (0.26 and 0.33 in) long with a brown coloration, while the larvae grow to a length of up to 22 mm (0.87 in). Egg laying occurs in June and July and the larval stages develop over a period of 3 to 5 years. The larvae pupate in August, but the adult beetles do not emerge from the soil until the coming spring.

from Wikipedia