Manage Colorado Potato Beetle
Resistant Colorado potato beetle populations are a reality – maybe even in your fields. But it’s possible to effectively manage the pest’s increasing resistance to Group 4 (neonicotinoid) insecticides.
The first sign can be reduced control:
Growers are reporting that the residual control of Colorado potato beetle (CPB) achieved by some of the old, Group-4 legacy products, is slipping. Be careful, that could be the first sign of resistance.
“It could very well be an early warning sign of insecticide resistance if you notice that some beetles seem to be coming back sooner after an application of a Group 4 insecticide than before”, says Dr. Jeff Tolman, an integrated pest management research scientist based at Agriculture and Agri-Food Canada’s Southern Crop Protection and Food Research Centre in London, ON.
How to reduce risk of resistance:
Resistance can, of course, also occur at time of spraying when some individuals from the beetle population are able to withstand the chemical being used better than others. The chance of resistance developing is much less when everyone uses recommended application rates. “Don’t cut rates,” Tolman stresses.
Both diligent scouting and following economic thresholds are also important tools for effective management of resistance to Group 4 insecticides. Also extremely critical is the rotational application of crop protection products with different modes of action.
DuPont Crop Protection is no longer offering Colorado potato beetle crop protection products, effective November 1, 2017. Please refer to our affiliate, Dow AgroSciences, at www.dowagro.com to find alternative crop protection products for Colorado potato beetle.
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