新宁县万丰山林场于1956年建立,总面积67096亩,历年人工造林43227亩,其中杉木林36276亩,1964年,杉幼林中曾发生少量的双条杉天牛为害,以后逐年增多,发展很快,现已遍及全场。为害较严重的达1500O亩,占杉木人工制的41.3％,一般受害致死的杉幼林约1O％左右,范家岭工区有5个小班共554.9亩,受害致死的幼林达5O——60％,其中有5亩幼 Xinfeng County, Wanfengshan forest farm was established in 1956, with a total area of ​​67096 acres, the calendar year artificial afforestation 43227 acres, of which 36276 acres of Chinese fir forest, in 1964, fir young forest there have been a small amount of Cunninghamia lanceolata damage, increasing year by year, the development Soon, now throughout the audience. More serious damage to 1,500 acres, accounting for 41.3% of the artificial cedar, the general population of about 1O% of the fatal fir young forest, Fanjialing work area has 5 small classes a total of 554.9 acres, the deadly young woods up to 5O - 60%, of which 5 acres of young