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近几年来,我地区红松林连续遭受红松梢象鼻虫(Pissodes nitidus)危害,部分林场受害较重,受害率约达60—70％。一九七四年发生面积1050亩,现已蔓延7800亩。该虫分成、幼虫两阶段危害,受害林木轻者针叶脱落、主梢干枯,树梢成扫帚状,重者整株死亡。从现地调查8—30年生红松均有受害,天然散生红松也有发生,平均虫口密度8—10头/株,最高可达23头/株,严重影响林木生长。我们于1983—1984年对该害虫进行了生活习性观察,现将所得材料整理于下。
In recent years, the Korean pine forest in my area has been endangered by the Pissodes nitidus, and some of the forest farms have suffered serious injuries, accounting for 60-70% of the total. In 1974 an area of 1050 acres, has now spread 7800 acres. The insects are divided into two stages of larvae damage, victims of light softwood off, the main shoots dry, treetops into a broom-like, heavy whole plant died. From the local investigation 8-30 years old pine are victims, natural pine also occur, the average population density of 8-10 head / strain, up to 23 / strain, seriously affecting the growth of trees. We conducted a survey of the habits of the pests in 1983-1984, and we now have the materials we collected below.