Abstract
The spider mite, Tetranychus takafujii Ehara and Ohashi,2002, is known to occur mainly on weeds and black nightshade in Tokyo, Osaka, Kyoto and Hyogo prefectures on Honshu island. In 2007, T. takafujii was found to cause heavy damage to cherry tomatoes in Kagoshima on Kyushu island. To test the possibility of chemically controling this spider mite, we tested its susceptibility to 18 acaricides/pesticides available for tomato and other vegetables in the Solanaceae using a leaf dip method. Spider mite females were highly susceptible to most acaricides/pesticides, except Etoxazole SC and Spirodiclofen SC which are categorized as slow-acting. Spider mite eggs were also highly susceptible to many of treatments, except Malathion EC, Bifentrin 2.0% WP, Emamectin benzoate EC, Chlorfenapyr SC and Bifenazate SC. Egg hatchability at day 4 were ranged from 24.7% to 89.4% among the treatments, and most neonate larvae died after 1 day of Emamectin benzoate EC, Chlorfenapyr SC and Bifenazate SC treatments. Results suggest that many of the treatments tested will be effective in controlling of T. takafujii either at the egg, larval or adult stage.
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