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经1981—1984年研究,明确了棉花苗期棉蚜为害对棉株生育及产量、品质的影响程度,依棉株卷叶(指卷曲半圆或全卷,下同)数的增多而加重。卷叶蚜量与苗龄、卷叶指数与卷叶株率和百株蚜量、卷叶指数与减产率均呈直线正相关。由卷叶指数(x)与减产率(y)的相关式:2叶期y=0.2445x+0.3772、4叶期y=0.1826x+0.0142和卷叶指数(x)与卷叶株率(y)的相关式:y=1.5223x+5.0058,结合当地棉花生产水平和防治水平,即可求得以卷叶株率为受害标志和不同产量水平下各苗期的防治指标。并于1985年进行了防治示范。
From 1981 to 1984, it was clarified that the degree of influence of cotton aphid infestation on cotton plant growth, yield, and quality was confirmed by the increase of cotton leaf curl (semicircle or whole curl, the same below). Aphid amount and seedling age, leaf index and roll leaf rate and the number of aphid per plant, leaf index and yield were linearly correlated. The correlation coefficient between leaf index (x) and yield (y) was: leaf phase y = 0.2445x + 0.3772, leaf phase y = 0.1826x + 0.0142 and leaf index (x) ): Y = 1.5223x + 5.0058, with the local cotton production level and the level of prevention and control, we can get the control index of the leaf wound plant rate and the seedling stage under different yield levels. In 1985, a prevention and treatment demonstration was carried out.