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(一)印楝油对水稻害虫的控制印楝油对水稻害虫褐稻虱及稻纵卷叶螟(Cnaphalocrocis medinalis)的忌避、拒食、抑制产卵及对形态构成方面的影响,在前几年已作了报道(国际水稻研究所1979、1980年报报告)。研究应用印楝油处理鳞翅目水稻粘虫(Mythimna separata)5龄初期幼虫(受药量≥62.5微克/幼虫),结果蛹及成虫的生长发育产生显著的畸型(表1)。将粘虫所产的新鲜卵块分别放入印楝油的几种浓度中浸渍片刻,卵的孵化完全被抑制。用较高浓度的玉米油处理粘虫卵块,孵化率同样降低。然而,用1.66％的洗涤剂或清水浸渍其卵块,却没有任何抑制孵化的效果(表2)。
(A) of neem oil on pests control Neem oil on rice pests Nilaparvata lugens and rice leaf roller (Cnaphalocrocis medinalis) avoidance, antifeedant, inhibition of egg production and morphological aspects, the impact of a few years ago Reported (International Rice Research Institute 1979, Annual Report 1980). The first 5 instar larvae of Mythimna separata were treated with neem oil (dose≥62.5 μg / larvae), resulting in significant deformities in the growth and development of pupae and adults (Table 1). The fresh egg masses produced by armyworms were immersed in several concentrations of neem oil for a while, and the egg hatching was completely inhibited. Treating the eggs of the armyworm at a higher concentration of corn oil also reduced the hatchability. However, its egg mass was impregnated with 1.66% detergent or water without any inhibition of hatching (Table 2).