Impacts of Neonicotinoid Resistance on Tobacco Thrips, Frankliniella fusca (Hinds), in the Mid-South
Dose-response bioassays with the three commonly used neonicotinoid insecticides were performed on field-collected adult female tobacco thrips during May and June, 2014 and 2015. Populations were collected from agricultural regions in Mississippi from wild hosts as well as from insecticide-treated crops. 2014 results showed resistance was largely limited to thiamethoxam and clothianidin in the Delta region. However, 2015 suggests resistance is rapidly increasing to all three neonicotinoids throughout the state. Over the past several years farmers have seen a decrease in tobacco thrips control from thiamethoxam. During the 2015 growing season similar control problems with imidacloprid were observed. Further research is planned to confirm findings and to explore the mechanisms that are responsible for resistance to these insecticides.
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