. Agricultural plant pest control : a study manual for commercial and governmental pesticide applicators . Weeds; Pests. essary. If beetles average 3 or more per 4 ears on any one scouting day during July and Au- gust, then a soil insecticide application should be considered for the following season. Notice- able damage will occur when populations reach 2 adults per ear. WirCWOWlS - (many sj)ccks of ik orkr Colcoyicm, family Ektcridac) Life cycle: The wireworm larvae are usually hard, dark brown, smooth, and wire-like. The larvae vary from 1/2 to 1 1/2 inches in length as mature larvae. The ad
. Agricultural plant pest control : a study manual for commercial and governmental pesticide applicators . Weeds; Pests. essary. If beetles average 3 or more per 4 ears on any one scouting day during July and Au- gust, then a soil insecticide application should be considered for the following season. Notice- able damage will occur when populations reach 2 adults per ear. WirCWOWlS - (many sj)ccks of ik orkr Colcoyicm, family Ektcridac) Life cycle: The wireworm larvae are usually hard, dark brown, smooth, and wire-like. The larvae vary from 1/2 to 1 1/2 inches in length as mature larvae. The adults are know as click beetles. They have an elongated body and are light brown to black in color. They can arch their backs when up-side down and "click" them- selves right-side up making a clicking noise. Mature larvae pupate in the soil in the late sum- mer, the adults overwinter. In the spring the adults emerge and the females lay eggs in the soil or plant roots. The larvae then hatch in a few weeks to begin feeding. Damage: They are very destructive and wide- spread pests of com. Crops often fail to germi- nate since the insects eat the germ of the seeds or hollow them out completely leaving only the seed coat. The crop may not come up well, or it may start well and become thin and patchy be- cause the larvae bore into the underground part of the stem causing the small plant to wither and die, though they do not cut it off completely. Their injuries are usually most severe to crops planted on sod ground or the second year from sod. Wireworm larvae. Habitat: Wireworms are common in gar- dens and fields. They are most common where the soil is high in organic mate- rial. Control: Crop rotation is an important long- term control method for wireworms. A 2 to 3 year rotation of alfalfa significantly reduces wire- worm populations in most infested fields in Mon- tana. NOTES ^ 109. Please note that these images are extracted from scanned page images that may have been di
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