早期的棉铃虫防治指标为百株卵量15粒。1981年修订为百株卵量15—30粒,幼虫2—3头。盛承发(1984)提出高肥田,第2代棉铃虫百株累计卵量300粒以下时,在保护顶尖不受危害的基础上,单株损失10个蕾,还可促进增产。类似的报道在国外也有,C.I.Keerthisinghe研究在斯里兰卡南部每10株棉花损失5个蕾和6个铃,对棉花 Early bollworm control indicators for a hundred eggs 15. 1981 revised to a hundred eggs 15-30, 2-3 larvae. Sheng Chengfa (1984) proposed a high fertility field, the second generation of cotton bollworm 100 strains accumulated less than 300 grains, the top protection from harm based on the loss of 10 individual buds, but also to promote yield. Similar reports have been made abroad, as C.I. Keerthisinghe studied the loss of 5 buds and 6 bells per 10 strains of cotton in southern Sri Lanka,