对1961年以来思茅林区松毛虫大暴发的过程进行了周期性分析，认为松毛虫的大暴发存在一定的周期性规律。
The occurrence of Dendrolimus of Simao forest district from 1961 was studied, and the results implied that the occurrence of this pest had periodicity.
对1961年以来思茅林区松毛虫大暴发的过程进行了周期性分析，认为松毛虫的大暴发存在一定的周期性规律。
The occurrence of Dendrolimus of Simao forest district from 1961 was studied, and the results implied that the occurrence of this pest had periodicity.
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