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对抗马尾松毛虫松树种的研究,是森林害虫综合防治工作的一项营林技术措施。在过去调查研究的基础上,我们于1972年对海南松进行引种造林,观察其抗虫能力;1979年5月初又分别在室外1.5米高左右的海南松、火炬松、湿地松和马尾松幼树上套1.6米高的铁纱笼饲养马尾松毛虫,并在室内用小铁纱笼以四种针叶进行对照饲养。其结果说明不同松树种的针叶作饲料,不仅直接影响马尾松毛虫幼虫的生长发育,还能影响其后代的繁殖。如火炬松针叶饲养的马尾松毛虫雌雄比为:室外套笼饲养的为15.38%;室内的为12.5%,比其他三种针叶饲养的比例均低,且雌蛾的怀卵量明显减少,平均每个怀卵量为38粒,最少的仅13粒,且卵的胚胎发育尚未完全,全部卵粒青色。相反马尾松针叶饲养的雌蛾卵粒绝大多数为粉红色。由此可见饲料不同对马尾松毛虫的繁殖有一定的抑制作用。
The research on pine tree species of Dendrolimus punctatus is a technical measure of forest management for the comprehensive prevention and control of forest pests. Based on the past investigations and studies, we planted and reared Pinus tabulaeformis in 1972 and observed its insect resistance. At the beginning of May 1979, we rewrote the Pinus tabulaeformis, Pinus taeda, Pinus elliottii and Pinus massoniana separately A 1.6-meter-high iron-stencil cage was used to feed the masson pine caterpillars in the trees and was controlled indoors with small iron saris in four types of needles. The results showed that needles of different pine species feed, not only directly affect the growth and development of Dendrolimus punctatus larvae, but also affect the reproduction of their offspring. For example, the male and female ratio of Pinus massoniana housed in Pinus taeda leaves was 15.38% in the indoor cage and 12.5% in the indoor area. The ratio of females was significantly lower than that of the other three kinds of needles, The average number of eggs for each of 38, at least only 13, and the embryo development of eggs is not yet complete, all ovoid green. On the contrary, the majority of female moths oaks fed by masson pine needles are pink in color. This shows that different feed on the propagation of Dendrolimus punctatus have a certain inhibitory effect.