Technical Abstract: Pacific coast wireworm (Limonius canus) and sugarbeet wireworm (Limonius californicus) are the most damaging soil-inhabiting insect pests of potatoes in the Columbia Basin. I summarized the biology of these pests, including information on phenology, development, movement in soil, monitoring, and chemical control. The note concludes with a list of research topics that should be addressed to lead to better options for managing these pests.