(14(4):47-49)THE NEW CITRUS PEST IN TAIWAN—TEXAS CITRUS MITE (EUTETRANYCHUS BANKSI (MCGREGOR))

有關臺灣為害柑橘枝葉之蜘蛛類中，柑橘紅蜘蛛（Panonychus citri（McGregor )）及柑橘黃蜘蛛 Eutetranychus sexmaculatos ( Riley )）近年來已有甚多之研究報告，尤對柑橘紅蜘蛛之藥劑防治及天敵調查已有了相當詳盡之記載，而柑橘褐蜘蛛（Eutetranychus bankei ( McGresor ) ) 在臺灣之發現尚屬首次，雖其目前所造成之災害並不嚴重，但仍有提早研究防範之必要。 Texas citrus mite Eutetraychus bcnksi (McGregor) was first found in Taiwan 1964, regarded as the pest of citrus. Its life cycle was 18-26 days in November. It may be identified by a tan to green body coloration marked on the back with several pairs of dark green to black spots. The body hairs of this species are short. Eggs are flattened and disc-like with a yellow, brown or pink coloration. Young mites are like the adults except for size. Newlyhatched mites are six-legged and lemon- yellow in color. Infestations of and injury to citrus by this mite are however, twigs have not been found to be infested. Heaviest infestation of this mite has been found to occur in fall, winter and early spring