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在我国南方日本松干蚧(Matsucocus matsumurae Kuwana)发生区存在着有虫无灾、严重成灾和轻度危害相对稳定的三种类型。本文应用生态因子对日本松干蚧数量变动的原因进行了较详细的研究,通过野外接种,观察测定和室内实验,得出影响日本松干蚧寄生若虫数量变动的关键因子为夏季高温。该虫寄生若虫在枝干上的死亡率阳面>阴面,阳坡>阴坡,疏林>密林,死亡率的高低与光照,温度密切相关。沿海地区松干蚧一般危害严重,内陆地区经常有虫无灾,这是由于海洋性气候和内陆性气候的关系。同时本文还提出了合理定株修枝,使林内通风透光,增强树势,对松干蚧具有一定的抑制作用。
In the area where Matsucocus matsumurae Kuwana occurs in the southern part of our country, there are three types of insects that are not affected by catastrophes, are seriously disastrous, and are mildly stable. In this paper, the ecological factors were used to study the causes of the variation of M. japonicum population in detail. The key factors influencing the variation of parasitic nymphs in Japan were Summertime high temperature through inoculation, observation and laboratory experiments. The mortality of parasitic nymphs on the branch stems is positive> negative, sunny slope> shady slope, sparse forest> dense forest. The mortality is closely related with light and temperature. Pine and gecko in the coastal areas are generally endangered, with frequent outbreaks in inland areas due to the relationship between the maritime and inland climates. At the same time, this paper also proposed a reasonable fixed-line pruning, so that the forest ventilation and enhance the tree vigor, has a certain degree of inhibition of songkranica.