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研究表明，棉花在苗期、蕾期和花铃期受棉花叶螨为害后，其株高、果枝数、果节数、伏桃及总成铃数和籽棉产量皆随着为害指数的升高，受影响程度加大；而影响程度又因棉花受害的生育阶段不同而异。苗期和蕾期受害影响程度显著大于花铃期。为害指数Ｘ与减产率Ｙ的关系式为：苗期Ｙ＝－０．８４８４＋５８．００４２Ｘ，蕾期Ｙ＝－２．０１０２＋５３．３１４６Ｘ，花期Ｙ＝－０．７７８９＋２６．８８３７Ｘ，据此确定，在皮棉产量１２００～１５００ｋｇ／ｈｍ２的植棉区，棉花叶螨的动态防治指标是：每１００株棉花中红叶株的为害指数为：苗期０．８４～１．０４，蕾期１．２３～１．５３，花铃期３．２８～４．０９。
The results showed that the plant height, the number of fruit branches, the number of fruit nodes, the number of bollworm, the number of bolls per plant and the seed cotton yield were all increased with the increase of the damage index after the cotton spider mites were damaged at seedling stage, bud stage and flower-boll stage. , Affected by the increase; and the degree of influence due to the different stage of the reproductive growth of cotton victims. Seedling and bud damage affected significantly more than the flower-boll stage. The relationship between damage index X and yield Y was as follows: seedling Y = -0.8484 + 58.0042X, budding Y = -2.0102 + 53.3146X, flowering Y = -0.7789 + 26.8837X, The dynamic control index of cotton spider mite in the cotton-growing area with the yield of 1200 ~ 1500kg / hm2 was as follows: the damage index of mid-leaf-red leaves per 100 cotton plants was 0.84-1.04 at the seedling stage and 1.23-1 at the bud stage. 53, flower ring 3.28 ~ 4.09.