论文部分内容阅读
南华松叶蜂Diprion nanhuaensis Xiao是云南松的重要害虫之一。除本省外,贵州也有分布。该虫在云南以为害云南松中幼林为主,对树木生长造成严重影响。在云南江川地区一年发生二代,以茧蛹越冬。越冬代成虫5月上旬,第一代成虫8月中旬开始羽化。幼虫进入三龄取食全叶为害加重;第一代7月,第二代(即越冬代)10月是幼虫为害盛期。本文提出了以营林措施为主的综合防治方法。由于成虫飞翔能力弱,喜产卵于两米以下松针叶肉内的习性,因此要求适树适地优质造林,加强幼林抚育,加快成林速度,使不利于成虫活动产卵;利用南华松叶蜂各虫态的发生与节令、物候及农林生产活动等的关系,进行虫情预测,适时采取人工捕杀幼虫,清除害虫茧蛹及必要的化学手段防治幼虫。
Dipterocarpus nanhuaensis Xiao is one of the most important pests of Pinus yunnanensis. In addition to this province, Guizhou also has distribution. The insects in Yunnan in that the risk of young pine forests in Yunnan mainly for the growth of trees have a serious impact. In the second generation of Jiangchuan in Yunnan one year, cocoon pups wintering. Overwintering adult adults in early May, the first generation of adults began to emerge in mid-August. Larvae into the third instar feeding full leaf damage worse; the first generation in July, the second generation (ie overwintering) October is larvae damaging period. This article proposes a comprehensive prevention and control method based on silviculture measures. Due to the weak ability of adults to fly and prefer to lay their eggs in the pine needles under two meters, it is required that the suitable afforestation should be suitable for afforestation, strengthen young forest tending and speeding up the forest planting so as to prevent the spawning of adult activities. The occurrence of the various insect states and seasonal orders, phenological and agricultural and forestry production activities, the relationship between the prediction of insects, timely take artificial killing larvae, removal of pests cocoon pupae and the necessary chemical means to control larvae.