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传统的理论认为棉花“带桃入伏、伏桃满腰、秋桃盏顶”是棉花高产的三个环节。其中伏前桃居第一位,具有龙头作用,因此,要力争保伏前桃。多年来将二代棉铃虫做为防治重点世代,经研究表明,保伏前桃代价太大,即使保住了,也明显地抑制了前期营养生长,进而消弱了中期的生殖生长,对产量很不利。摘除早蕾,旨在保护棉花生长点,形成新的棉花结构:无伏前桃、少晚秋桃、多伏桃。棉花蕾铃脱落是一种生态适应,自我生理调节。一般自然脱落率60—70％,高者达90％。棉花具有很强的“补偿”能力,对环境波动有很强的适应性、对虫害也有“超补偿”能力。这是棉花抗逆本能的反应。据此,前期摘除部分早蕾,不但不减产,反而增产,且减轻了苗蚜和二代棉铃虫的危害。据中国农科院动物研究所和我们连续三年的多点试验,二代棉铃虫取食或前期摘除早蕾一般可增产15—20％,高的达30％以上,达到了省药、省工、治虫、防病和增产的综合效应。
The traditional theory that cotton “with peach, vase full waist, autumn peach top” is the cotton yield of the three links. Among the former V Tuozhu first place, with the leading role, therefore, to strive to protect the peach before. Over the years the second generation of cotton bollworm as a key generation prevention and control, the study shows that the price of peach before the peach is too large, even if preserved, but also significantly inhibited the pre-vegetative growth, thereby weakening the medium-term reproductive growth of the yield is unfavorable. Remove the early bud, designed to protect the cotton growing point, the formation of a new cotton structure: no volt peach, late autumn peach, peach peach. Cotton buds fall off is an ecological adaptation, self-physiological adjustment. The general rate of natural exfoliation 60-70%, up to 90%. Cotton has a strong “compensation” capacity, a strong adaptability to environmental fluctuations, also have “super-compensation” capability for pests. This is a cotton reaction instinctively. Accordingly, some early buds were removed early, not only do not cut production, but increased production, and reduce the seedling aphids and the second generation of bollworm harm. According to the Institute of Zoology, Chinese Academy of Agricultural Sciences and our continuous three-year trial, the second generation of cotton bollworm feeding or premature removal of early bud can generally increase 15-20%, up to 30% or more, reaching the provincial medicine, provincial Workers, pest control, disease prevention and increase the combined effect.