1963年5月在石嘴山市的大武口公社大武口及新联大队,发现小麦长腿红蜘蛛(PeLrobia Latens Muller)为害小麦。大武口大队发生面积占小麦播种面积2,300亩的70％,受害严重的700多亩,98％的植株有虫,平均每株虫口密度13头,每5市尺长麦行可击落红蜘蛛150头左右,最多的达1,244 In May 1963, at Dawukou commune, Dawukou commune in Shizuishan city, and in the new brigade, PeLrobia Latens Muller was found to be wheat-harmed. The area where the Dawukou brigade took up was 70% of the 2,300 mu of wheat sown area, 700 mu of serious damage, 98% of the plants had pest, the average density of each pest population was 13, and every 5 scholarly barley lines could shoot down 150 spider mites So up to 1,244