Insecticide resistance continues to be a focus. University of Minnesota Extension Entomologist Ian MacRae reminds farmers to stay up to date on their herbicide practices, especially where aphids are involved. “You see an asexual reproduction all the way through the summer so if you have a couple of individuals in those populations that survive insecticide, that’s going to get magnified through that population fairly quickly,” said MacRae. “There’s six to eight generations of aphids every year so you get a rapid turnover.” Due to the level of resistance in aphids, MacRae urges patience. “What I would recommend is only treating when you have those thresholds at 250 aphids per plant.”
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