1病虫害的演变及发生趋势北疆棉区位于天山北麓准噶尔盆地南缘的玛纳斯河流域和博尔塔拉河下游一带，该区常年≥10℃有效积温3450—3600℃，无霜期150—170天，80年代中期以前棉田主要害虫有黄地老虎、烟蓟马和盲蝽象，棉黑蚜、拐枣蚜、棉长管蚜、棉叶螨和棉铃虫也时有发生，但 1 Pests and diseases evolution and trend of occurrence The northern Xinjiang cotton area is located in the north of the Tianshan Mountains in the southern margin of the Manas River Basin and Bortala River area, perennial ≥ 10 ℃ effective accumulated temperature 3450-3600 ℃, frost-free period 150-170 Day, the main pests in the cotton fields before the mid-1980s were yellow tiger, thrips tabaci and lizards, cotton black aphid, turnip aphids, cotton aphids, spider mites and cotton bollworm also occur, but