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一、森林中害虫白僵病的流行森林中害虫白僵病的流行,往往是抑制害虫大发生的主导因素。据报导1954年湖南新宁、湘潭等地几万亩松林中的松毛虫发生
First, the prevalence of white stiff stiff pests in forest endemic pests White stiff disease is often the dominant factor in inhibiting the occurrence of pests. It is reported that in 1954 Hunan Xinning, Xiangtan and other tens of thousands of mu of pine in the pine caterpillars occurred