松材线虫病流行与松毛虫危害关系的研究

研究表明 :在松材线虫病发生区 ,其病害的扩展、流行与马尾松毛虫危害有着密切的关系。当年受马尾松毛虫危害的松林 ,枯死松树数量平均为 77 879株 /hm2 ,比未受松毛虫危害的松林 (对照 ) 17 2 73株 /hm2 ,多 35 1% ;次年 ,前者平均枯死松树达 2 0 4 8株 /hm2 ,为对照 2 89株 /hm2 的 6 0 8%。松毛虫危害加速松材线虫病流行的原因是 ,松毛虫危害松树 ,削弱树势 ;弱势的松树招引松墨天牛侵入并增殖加快松树死亡 ;次年大量天牛从“松毛虫危害松木”上羽化 ,侵染健康松林 ,导致松材线虫病进一步扩散和流行。由此认为松毛虫危害是促使松材线虫病流行的重要因子 ,防治松毛虫是控制松材线虫病流行的重要环节之一

Study on the relations between the epidemic spread of pine wilt disease and pest of pine caterpillars Dendrolimus punctatus Walker

This paper showed a close relationship between epidemic spread of pine wilt disease caused by Bursaphilenchus xylophilus and pine pest i.e. pine caterpillar, Dendrolimus punctatus in the nematode infected pine forest.The average of dead pine trees caused by PWD in the forest with pine caterpillars was 77 879 trees per hm 2,351% more than,the average of 17 273 dead trees per hm 2 in CK pine forests(without pine caterpillars).Next year the average of the dead reached 20 84 trees per hm 2,608% more than, the average of 2 89 dead trees per hm 2 in CK.Why pine caterpillars accelerated epidemic spread of PWD was the Monochamus alternatus became the bridge which combined pine caterpillars with PWD.Thus,controlling pine caterpillars is one of the most important methods to check the epidemic spread of PWD.