不同栽植模式下柳杉毛虫发生特点研究

Study on Occurrence Characteristics of Dendrolimus houi in Different Planting Modes

对不同栽植模式下柳杉毛虫的虫口密度和危害性进行研究分析。结果表明,柳杉林地面积越大,柳杉毛虫聚集度越高,对柳杉的危害性越大;柳杉纯林、柳杉混交林、散生柳杉3种不同栽植模式对比分析,柳杉纯林虫口密度最大,柳杉失叶率、死亡率也较高;其次是柳杉混交林;散生柳杉失叶率、死亡率最低。

In this paper, the population densities and hazards of Dendirolimus in different planting modes were studied andanalyzed. The results showed that the larger the area of Cryptomeria fortunei forest and the higher the degree of aggregation of Deudrolimus houi, the greater the hazards of Cryptomeria fortuuei; a contrastive analysis of three planting modes showed that pure forests of Cryptomeria fortunei had the largest population density of Dendrolimus houi and suffered the highest leaf loss rate and mortality, followed by mixed forests of Cryptomeria fortunei, and scattered forests of Cryptomeria fortunei had the lowest leaf loss rate and the lowest mortality.