苹果斯氏刺瘿螨发生与危害调查

斯氏刺瘿螨是四川省苹果上新发现的一种危害苹果叶片的害螨，以雌成螨在苹果芽的芽腋两侧越冬，翌年苹果芽萌动时开始出蛰。全年以５月中旬至６月中旬发生数量最多。气候温暖、低湿、少雨发生重，相反则轻。在调查的８个品种中，叶片多茸毛的品种受害重。天敌主要为捕食螨

Occurrence and Injury of the Apple Rust Mite Aculus schlechtendali (Keifer)

The apple rust mite,Aculus schlechtendali (Keifer) is a new pest of apple leaves in Sichuan Province The female adults overwinter on the leteral bud axil, and begin to move when the buds grow in the next year The injury by this pest is more serious under the conditons of moderate temperature, low humidity and less rain The damage is more sevious in varieties with more pubesconce in leaves among 8 varieties investigated The predatory mite is dominant natural enemy against the rust mite in Sichuan The maximum numbers of the pest occured from the middle of May to the middle of June