山楂红叶螨Tetranychus viennensis Zacher在我省各苹果产区发生极为普遍,且为害严重,特别是气候干旱年份发生尤重。常使树叶枯黄,造成早期落叶,使生产蒙受很大损失。为此于1962—1964年对其生物学特性和田间发生规律进行了调查研究,兹将结果介绍于后。 Tetranychus viennensis Zacher hawthorn spider mites in the apple-producing areas in our province is extremely common, and devastating, especially in the dry climate particularly serious year. Leaves often yellow, resulting in early leaves, so that production suffered a great loss. To this end in 1962-1964 on its biological characteristics and field occurrence of a regular survey, the results will be introduced later.