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1972—1973年在关中棉区调查分析表明:棉铃虫第二、三代卵在棉田里呈核心分布型,也符合负二项分布型,是成虫产卵对棉株有一定选择性和外界因子影响棉株状态不一致的综合表现。幼虫在棉田内也呈核心分布型,但随着幼虫长大转移,及天敌等自然因素和喷药防治的影响,虫口密度减少,可转变成波松分布型。幼虫为害的棉花蕾铃在田间也呈核心分布型,随着幼虫为害的发展,为害蕾铃与植株增多,转变成嵌纹分布型。着卵株在田间呈波松分布型,也符合嵌纹分布型。着卵株率(p)和百株卵量(m)呈p=3(?)+0.265m-3.6763的抛物线关系。根据反函数关系m=(?)可从着卵株率计算百株卵量。作者按此公式制定了从着卵株率(p)求百株卵量(m)的检索表。田间调查,采用检查着卵株率,查表即知百株卵量,可以节约工作时间。
The investigation and analysis in Guanzhong area from 1972 to 1973 showed that the second and third generations of cotton bollworm showed the core distribution in cotton field and the negative binomial distribution, Cotton plants inconsistent state of the overall performance. The larvae also showed a core distribution in the cotton field. However, with the growth and metastasis of larvae, natural enemies and other natural factors as well as the effects of spraying and controlling, larvae decreased in density and changed into the Poisson distribution pattern. The larvae damaged cotton bolls also showed a core distribution pattern in the field. With the development of larvae damage, the damage of budding bolls and plants increased and the distribution became the pattern of embedded patterns. Oviposide in the field was Poisson distribution, also consistent with the distribution of embedded patterns. The parabola relationship between the egg plant rate (p) and the number of eggs per 100 m (m) was p = 3 (?) + 0.265m-3.6763. According to the inverse function m = (?) Can be calculated from the oviparous rate of one hundred eggs. According to the formula developed by the author from the egg plant rate (p) to find one hundred eggs (m) of the search table. Field survey, check the egg plant rate, look-up table that is known as a hundred eggs, you can save working time.