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在较高大树木上危害的森林昆虫,当其种群的密度不是很高,或种群未处于大量取食的虫态(一般为末龄幼虫)时,往往不易被发现。大量取食后不久,种群突然消失,只留下一些危害过的痕迹。危害痕迹中寄主林木被害状能提供的信息极有限,害虫的头壳也很难找到,而虫粪却易于发现且能提供较多的信息,成为确定害虫种类的线索。国外已有不少文献肯定了虫粪对于识别虫种的辅助作用,还编制了若干种森林害虫的虫粪检索表。国内仅对马尾松毛虫虫粪在监测其幼虫种群数量方面作过较详细的研究,尚未见到用虫粪识别虫种方面的研究。
Forest insects harmed on taller trees tend to be harder to find when their population density is not very high, or when the population is not in a predatory (usually late-stage larvae) habitat. Shortly after a large number of feeding, the population suddenly disappeared, leaving only some traces of harm. Harm traces of host trees can provide very limited information, the pest head shell is also very difficult to find, but pest excrement is easy to find and can provide more information, become the clues to determine the types of pests. Many foreign literature has affirmed the auxiliary role of pest excrement identification of species of insects, but also prepared a number of forest pest insect excrement retrieval table. Domestic only to Dendrolimus punctatus in monitoring its population larvae have done a more detailed study, but we have not yet seen the insects to identify insect species research.