The Northern Canola Growers Association hosted a virtual research conference on Thursday. Throughout the morning, attendees heard about canola fertility trials, blackleg and clubroot resistance, the 2020 breeding program and more. NDSU Extension Entomologist Jan Knodel reflected on insecticide resistance for flea beetles. “Insecticide seed treatments are still working for control of the crucifer flea beetle. Newer mode of action were slower to cause mortality, but we had excellent feeding injury ratings. Even though they’re still alive, they don’t feed,” said Knodel. “The striped flea beetles had lower mortality and higher feeding injury rates, which suggests some tolerance or the development of insecticide resistance in the species.”
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