Ralph Pearce A new twist in the spider mite fight Insecticide resistance grows and new species emerge With hotter and drier summers, mites’ populations spread and increase, making them more visible. Growers are helping provide field samples to researchers looking at appearance and resistance patterns. ONTARIO GRAIN FARMER AGRONOMY 28 Soybeans have been hammered by an increasing number of challenges, from aphids to herbicide-resistant weeds to increased genetic resistance in soybean cyst nematode. Now, researchers are responding to insecticide resistance in two-spotted spider mites…and with it, some concerning trends. Research funded in part by Grain Farmers of Ontario is supporting a team led by Prof. Vojislava Grbic of Western University’s Department of Biology that is studying two-spotted spider mites’ rapidly developing resistance to insecticides. Photo: Daren Mueller, Iowa State University, Bugwood.org
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