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东台市地处苏北黄海之滨,属江苏沿海棉花旱粮耕作区。棉花害虫70年代为害严重,80年代数量有所下降。为害减轻的种类有棉铃虫、棉蚜、红铃虫、棉叶螨,小地老虎和金钢钻等;80年代中黑盲蝽上升,主要为害小铃,损失较重,棉田玉米螟上升为主要害虫,损失列诸棉虫之首。防治后乃损失5%左右,占主要棉虫为害损失的1/2。棉花主要害虫种类和种群数量发生变化的原因:①受气候的影响。80年代年平均气温比70年代平均低0.34℃,没有一年超过常年平均温值,而降雨量比70年代高112.2毫米,5～
Dongtai is located in the northern coast of the Yellow Sea, Jiangsu Province is a cotton coastal cotton farming area. Cotton pests were severely devastated in the 1970s and the number declined in the 1980s. The types of mitigation were Helicoverpa armigera, cotton aphid, red bollworm, cotton spider mite, small tiger and golden diamond, etc. In the 1980s, the black bugs rose, the main damage bell, heavy loss, cotton borer rose to The main pests, the first column of the loss of cotton insects. After the control is about 5% loss, accounting for the main loss of damage of cotton insects 1/2. Cotton main pests species and population changes in the number of reasons: ① by the impact of climate. The annual average temperature in the 1980s was 0.34 ℃ lower than the average in the 1970s, not exceeding the annual average temperature in one year, while rainfall was 112.2 millimeters above the 70’s,