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1973-1982年在南京、杭州、无锡等地建立了试验林,对日本松干蚧进行了一系列综合防治试验。制定了日本松干蚧生命表,分析了松干蚧花蝽、大赤螨、瘿蚁等捕食性天敌的作用。试验表明,促使松干蚧种群数量下降的关键是在具备一定数量捕食性天敌条件下的苏云金杆菌蜡螟变种松干蚧品系的流行,这种杆菌的流行可导致松干蚧种群急剧下降至“经济允许水平”以下。秋季喷菌时间离10月上旬越迟,感病越低;喷菌时间在5-7月或11月及其后,效果都不好;春季3-4月效果中等。翌春温高湿低,特别是干旱,松干蚧杆菌病流行速度减慢。其机理主要是对雌成虫和初孵若虫喷菌时湿度要很高,喷菌后松干蚧虫体要积水才易感病。对松干蚧其他虫态用喷杆菌方法还不易使其感病。 试验还证明,六六六丁体对此菌有强烈抑制作用。过去各地使用过量六六六防治松毛虫,是招致松干蚧大发生的原因之一。
1973-1982 in Nanjing, Hangzhou, Wuxi and other places to establish a pilot plantation, Japan Songkuai carried out a series of comprehensive prevention and control tests. The life table of Japan pine scale was established, and the predatory natural enemies such as the flower bug, the big red mite and the ants were analyzed. The test showed that the key to promote the population decline is to have a certain amount of predatory natural enemies under the conditions of Bacillus thuringiensis waxy stems and slashs colza epidemic prevalence of this bacterium can lead to a sharp decline in the population of tortoise clogs to “economic allowable level” below. The late autumn spraying time from early October, the lower the susceptibility; spraying time in May-July or November and thereafter, the effect is not good; spring 3-4 months medium effect. The next spring high temperature and humidity is low, especially in the drought, dry loose velvetleaf epidemic slow down. The mechanism is mainly female adults and newly hatched nymph when the humidity to be high, after spraying fungus to dry water insects susceptible to water disease. Other insects of dry scales Kuwana use of Bacillus is not easy to make it susceptible. The experiment also proves that the sixty-six body has a strong inhibitory effect on this bacterium. In the past, excessive use of 666 to control pine caterpillars is one of the causes of the occurrence of pine cercariae.