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作为松材线虫病(Bursaphelenchus xylophilus)的最重要传播媒介,松褐天牛已成为控制松材线虫病的重点。明确松褐天牛各虫态在不同地区寄主树干上的分布,对因地适宜地释放天敌昆虫有着重要意义。为此,本研究通过解剖受害马尾松,结合林间调查,系统地研究了松褐天牛产卵刻槽、幼虫和蛹在马尾松树干上的分布规律。结果表明:松褐天牛产卵刻槽主要分布在树干的2.5 6.5 m范围内,刻槽数量与树干高度和胸径显著相关;松褐天牛幼虫数量与树干胸径关系不显著;多数蛹室位于侵入孔正上方,少数蛹室位于侵入孔下方,两种蛹室数量差异显著;两种蛹室与侵入孔中心的平均距离分别为3.93 cm和4.39 cm,两者之间差异不显著;并建立了松褐天牛幼虫在马尾松树干上的垂直分布模式图。本研究表明了松褐天牛种群密度与寄主树木大小的关系,为释放天敌进行生物防治提供了基础。
As the most important vector of Bursaphelenchus xylophilus, Monochamus alternatus has become the focus of control of pine wilt disease. It is of great significance to clarify the distribution of various insect states of Monochamus alternatus on the trunk of the host in different regions and to release the natural enemy insects properly due to the local conditions. Therefore, this study systematically studied the distribution rules of oviposition grooves, larvae and pupae on the trunk of Pinus massoniana Monochamus alternatus by dissecting the damaged masson pine and combining the forest survey. The results showed that the oviposition grooves were mainly distributed in the range of 2.5 to 6.5 m of trunk, and the number of notches was significantly related to trunk height and DBH. There was no significant correlation between the number of larva and the diameter at trunk of trunk. The majority of pupal chambers were located in There was a significant difference in the number of pupal chambers between the two pupal chambers and the invaded holes. The average distances between the two pupal chambers and the centers of invasive holes were 3.93 cm and 4.39 cm, respectively. There was no significant difference between them. The vertical distribution pattern of the Monochamus alternatus larva on the trunk of Pinus massoniana. This study showed that the population density of Monochamus alternatus was related to the size of the host tree and provided the basis for the biological control of natural enemies.