摘要
作者于 2 0 0 3年 5月至 1 1月对沙棘木蠹蛾卵和幼虫的危害特性和种群数量的时空动态进行了研究 .结果表明 :沙棘木蠹蛾主要产卵在干部树皮裂缝、伤口等处 ,卵孵化后 ,初孵幼虫首先取食树干的韧皮部 ,然后逐渐向下转移危害根部 .根部幼虫主要取食木质部 ,形成多条纵向的蛀道 ,通过蛀道在主根与侧根、侧根与侧根间进行转移危害 .树干上的卵和初孵幼虫多集中在 2m以下 ,而根部的幼虫主要聚集在距离地面 2 0cm以内的主根上 .从 5月至1 1月 ,非当年生幼虫基本呈现递减的变化趋势 ,6月和 1 0月减少的幅度较大 .当年生幼虫则从 7月逐渐增加至 9月达到最大 ,而后又急剧减少 .从 8月到 1 1月 ,幼虫的聚集位置和种群数量都呈现向树下部转移的趋势 ,1 0月初转移至根部的幼虫达 70 5 %,树干上分布的仅有 2 9 5 %,且大部分都集中在树干 1 2m以下的位置 .1 1月初 ,幼虫已基本转移至地下根部 ,此时树干上幼虫分布很少 .
The harm characteristics and population dynamics of Holcocerus hippophaecolus eggs and larvae were investigated from May to November, 2003 in Jianping County, northeast China. The eggs of seabuckthorn carpenterworm are largely distributed in the crevices and wounds of the stem of host trees. The newly-hatched larvae first harm the phloem of the stem and then transfers from the stem to the root. The larvae under the ground mainly damage the xylem and transfers between the taproots and the lateral roots. The eggs and larvae mostly aggregate below the 2 m height of the stem and the larvae in the roots aggregate within 20 cm of taproots under ground. From May to November, the larvae hatched in past years descended, especially in June and October. Then the larvae hatched in the new-year increased gradually from July and culminated in September, but decreased sharply later. From August to November, both aggregation location and population quantity of the larvae transferred from the stem to the root. In early October, 70.5% of larvae distributed in the root, and only about 29.5% in the stem, mainly aggregating below 1.2 m of the stem. In November, almost all larvae stayed in the root, seldom in the stem.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2005年第1期70-74,共5页
Journal of Beijing Forestry University
基金
水利部沙棘开发管理中心项目 (2 0 0 2 0 8) .
关键词
沙棘木蠹蛾
卵
幼虫
危害特性
种群动态
Holcocerus hippophaecolus, eggs, larvae, harm characteristics, population dynamics
