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几年来,丰宁县大面积松林连年遭受不同程度的松毛虫害,严重的地方,平均每株有虫五六十条甚至上百条,所有针叶几乎被吃光,整个林子状如火烧。丰宁县成灾的松毛虫有落叶松毛虫和油松毛虫两种。在不同林子里,有的前者多于后者,有的后者多于前者,有的两种虫子几乎等量发生,有的各自单独成灾。这两种松毛虫的生活史不同,如落叶松毛虫结茧、化蛹、羽化、产卵要比松油毛虫早一个月,这就为我们利用落叶松毛虫的蛹和卵培育寄生蜂防治油松毛虫提供了条件。今年,我们进行了用落叶松毛虫卵繁育赤眼蜂防治油松毛虫的试验,试验结果证明:繁蜂快,防效好。现将其法简介如下:
In recent years, large-area pine forests in Fengning County have suffered from various degrees of pine caterpillars year after year. In severe places, the average number of pests per plant is fifty or sixty or even hundreds. All the coniferous leaves are almost eaten, and the whole forest is like a fire. Dendrolimus dendrocalamus in Fengning county has two kinds of pine caterpillar and pine caterpillar. In the different forests, some of the former were more than the latter, while the latter were more than the former. Some of the two kinds of insects occurred in almost equal amounts, and some of them were individually disastrous. These two kinds of pine caterpillars have different life histories, such as the cocoon of the pine caterpillar, pupation, eclosion, spawning than the pine oil caterpillars one month earlier, which is for us to use the pupae and eggs of the pine caterpillars to develop parasite control oil Moth caterpillars provided the conditions. This year, we carried out the experiment of breeding Trichogramma with Tricholoma matsutake preventing and curing the Pinus tabulaeformis. The test results show that: the fast bee, the good effect. Now its method is as follows: