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分别用被害针叶和当年生新叶饲养马尾松毛虫(Dendrolimus punclalus Walker),测定其对松毛虫生长发育和繁殖的影响;用被害针叶和当年生新叶饲养的第1代马尾松毛虫蛹重明显下降;还模拟越冬代大发生后第1代松毛虫在老叶吃尽,被迫取食当年生新叶的情况.1～4龄松毛虫幼虫用老叶饲养,5龄后换用当年生新叶,其结果较正常取食的幼虫历期延长,蛹重下降,死亡率升高.上述结果为阐明马尾松毛虫猖獗后种群急剧下降的原因提供了依据.
Dendrolimus punclalus Walker was separately fed with the harvested needles and new year leaves, and the effects on Dendrolimus punctatus growth and reproduction were determined. The first-generation Dendrolimus punctatus But also significantly decreased, and the first generation of Dendrolimus punctatus was mined in the old leaves to simulate the overwintering generation.They were forced to feed the new leaves of the year.The larvae of the first to the fourth instar Dendrolimus punctatus were reared on the old leaves and replaced after the 5th instar Compared with normal larvae fed on new leaves, the results showed longer duration, lower pupal weight and higher mortality rate, which provided the basis for clarifying the reasons for the sharp decline of population after the rampant Masson pine caterpillar.