Wireworms are the most important soil-dwelling pest of potatoes in the U.S. In the Pacific Northwest significant potato crop losses of 5-25% from wireworm damage are common, with losses resulting in millions of dollars annually. Growers in the U.S. rely on preventative soil insecticide treatments for wireworm control. The 5 registered organophosphate and carbamate insecticides are only moderately-effective often resulting in sporadic control of wireworms. The Environmental Protection Agency is in the process of re-registering pesticides under the requirements of the Food Quality Protection Act and could eventually cancel some or all organophosphate and carbamate pesticides on potatoes. We conducted insecticide trials for three years with the overall goal of anticipating the possible cancellation of broad-spectrum pesticides by determining potential chemistries that would reduce wireworm damage. We also conducted experiments to determine when tuber damage occurs in the field, as this information would allow growers to make more effective use of the products being tested, and would also allow growers to know how long a pre-plant chemical needs to last in the field to prevent damage. Results are presented.