Rotating New Chemistries
in Potato Pest Management
By Russell L. Groves, Ph.D.
Extension Vegetable Entomology
Specialist & Associate Professor
University of Wisconsin, Madison
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This presentation will help consultants, growers, and other pest management practitioners in the upper Midwest potato growing region(s) to better understand the need for effective rotation of insecticide chemistries to gain adequate and longer-term control of problematic insect pests like the Colorado potato beetle. This insect pest has a long history of rapidly generating resistance to most pesticides in the Eastern and Midwestern US. Over the past 15 years, the principal form of control used to management populations of the Colorado potato beetle has been centered on the use of the neonicotinoid class of insecticides (IRAC 2013, Mode of Action Class 4A). This reliance has lead to the development of localized resistance and novel, reduced-risk insecticides are now required to offset these losses in control. An improved understanding of how effective insecticide rotations, using different MoA classes, is a key component of effective insecticide resistance management planning.