马尾松是我区主要用材树种之一,种植面积广,但常遭受松毛虫的为害,猖獗年份针叶可全被吃光,轻者影响松树生长,重者致使枯死.据玉林地区林科所从1973年起进行观察记载,该所1959年种植的松树,1973～1978年曾发生三次严重的松毛虫为害,其中发现若干株松树能避免受害,经编号检 Pinus massoniana is one of the main timber species in our district, planting a wide area, but often suffer the damage of pine caterpillars, rampant conifer can be eaten all the light, the light of the pine growth, severe cases caused by deads.According to the Yulin Area Forestry Branch It has been observed since 1973 that the pine trees planted in 1959 had three serious detritivores in 1973-1978. Some pine trees were found to be able to avoid the damage. The number of seizures