To date, the in-plant distribution of the in-furrow, systemic neonicotinoid classes (IRAC MoA 4A) of insecticides are relatively unknown in potato. Variable insecticide concentration and distribution over time is thought to affect resistance development in numerous insect pests, including key pests of potato (Gould, 1984, Isaacs, 2002, Daniels et al., 2009). Dynamic insecticide expression in the crop creates sub-lethal refuges promoting the evolution of behavioral and physiological mechanisms of resistance (Hoy et al., 1998). Documentation of insecticide within potato foliage throughout the growing season will generate a concentration profile for systemic use patterns. Insecticide expression patterns will better inform times at which the crop expresses sub-lethal insecticide doses that have direct implications for resistance management of key insect pests in potato. Connecting the amount of insecticide delivered to the proportion taken up by the plant season-long is a key factor in documenting overall in-plant concentration and environmental fate of insecticides.
Soil Science Extension
University of Wisconsin Madison