Control of Wireworms on Summer Potatoes in Eastern Washington123

Abstract

When granular carbofuran, Dyfonate® ( O -ethyl S -phenyl cthylphosphonodithioate), and parathion were applied in mid-March for control of the Great Basin wireworm, Ctenicera pruinina (Horn), and the Pacific Coast Wireworm, Limonius canus LeConte, on summer potatoes, band treatments at a rate of about 2.3 lb of toxicant per acre gave better average control with less variation than broadcast treatments with 4–8 lb of the same toxicant per acre. The reverse has been observed when similar treatments were applied in mid-April or later for control of these wireworms on fall potatoes.