松毛虫发生世代与世代分化

本文论述松毛虫发生世代和世代分化的复杂性,包括落叶松毛虫、马尾松毛虫、赤松毛虫和油松毛虫等。发生世代因地区不同而异。在同一地区,由于松毛虫幼虫的滞育,常出现世代分化。世代分化比例在不同地区、不同年份、不同松林和不同树木之间都有差异。在同一地方,不同年份也有差异。滞育与幼虫孵化期、气候、生态条件和食料有关。本文还讨论了“油松毛虫发育起点温度和有效积温的研究”〔林业科学,1987,23(3)〕的有关问题。

ON GENERATION AND GENERATION DIFFERENTIATION OF PINE CATERPILLARS (DENDROLIMUS SPP.)

This paper deals with the complication of number of generations and generation differentiation of pine caterpillars, which include Dendrolimus superans (Butler), D. spectabilis Butler, D. punctatus and D. tabulaeformis Tsai et Liu etc. in USSR, Japan and China. The number of generations of pine caterpillars varies in different areas. In general, there is one generation in 1-3 years for D. superanus, passing 2-4 winters, 1-3 generations a year for D. tabulaeformis and D. spectabilis, 2-5 generations a year for D. punctatus. Generation differentiation is a common occurrence, which is caused by larval diapause. Differentiational rate varies greatly in the population of Dendrolimus spp. in different plots, even in the same plot, it varies in different years too. The diapause of pine caterpillar is relevant to the larval hatching period, food, climate and other ecological conditions. In the paper, some ideas about "a study of developmental threshold and effective accumulated temperature of D. tab-ulaeformis" in the "Scientia Silvae Sinicae" 1987, 23(3), have also been put forward.