【摘要】 江川小松叶蜂(Microdiprion sp.)1987～1989年在云南江川地区严重为害云南油杉(Keteleeria evelyniana Mast.),树木受害后似火烧状。该虫一年发生三代,以预蛹越冬。越冬代及第一、二代成虫分别于翌年2月中旬、7月上旬及9月下旬羽化。幼虫进入四龄后为害加剧;第一至第三代幼虫分别于5月中旬至6月、8月中旬至9月中旬、11月中旬至12月上旬发生为害,以第一代为害较重。幼虫受多种寄生生物寄生,其中一种小蜂的寄生率达42%。本文就此虫害提出了化学防治的指标及防治意见。更多还原

【Abstract】 This paper reports the results of a preliminary study on the biology and control of Jiangchuan pine sawfly(Microdiprion sp.)heavily infesting the stands of Keteleeria evelyniana Mast.in the county during 1987～1989. The life history and behavior of this pest are closely observed both in the field and laboratory.The data show that the pest produces3 generations a year.The author cmphasizes that the population of the first generation larvae being the most abundant,should be targeted for controlling.A few insecti- cides have been tested in the field and all have shown promising results.Mean- while,the author points out that the host trees with the larva density below 80/tree can be protected only by natural biological control agents.更多还原