Susceptibility to Hexythiazox of Eggs and Larvae of European Red Mite (Acari: Tetranychidae)

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Abstract
Laboratory bioassay techniques were developed for testing the susceptibility to hexythiazox of European red mite (ERM), Panonychus ulmi (Koch). These techniques were used to establish baseline susceptibility to hexythiazox of eggs and larvae of a New York population of ERM. Winter and summer eggs were tested by both contact ovicidal and residual larvicidal exposure. Summer eggs were nine times more susceptible to hexythiazox than winter eggs (LC50 values 2.2 and 20.0 ppm, respectively). Susceptibility of winter and summer eggs decreased when eggs were treated within 2 d of hatch. When exposed to hexythiazox residues, mites usually died in the nymphochrysalid stage or lived to adulthood; few died in the protonymphal or deutonymphal stages. Mortality (95% CL) of larvae emerging from winter eggs was 94-100% after exposure to leaves treated with 100 ppm hexythiazox. Larvae that emerged from summer eggs were not able to survive foliar residues when eggs and leaves had been dipped in ≥6 ppm hexythiazox.

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