转换寄主对马尾松毛虫生长发育与繁殖的影响

在室内条件下,分别用马尾松针叶(Pinus massoniana Lamb.)、湿地松针叶(Pinus elliottii Engelm)、以及在不同的幼虫龄期从用马尾松针叶转移到用湿地松针叶饲养马尾松毛虫Dendrolimus punctatus Walker,观察转换寄主对马尾松毛虫生长发育与繁殖的影响。结果表明:(1)从用马尾松针叶饲养转换到用湿地松针叶饲养,可显著影响马尾松毛虫生长发育和繁殖参数;而且当在马尾松毛虫幼虫老龄期进行转换寄主饲养比低龄期转换寄主饲养,可显著缩短马尾松毛虫幼虫的发育历期,降低死亡率,同时,可显著增加幼虫体重、蛹重和化蛹率;对食物的营养效应也越强。(2)取食马尾松的松毛虫较取食湿地松的马尾松毛虫发育历期短,死亡率低,幼虫及蛹重增加,产卵量高。结果说明,马尾松毛虫从马尾松转换移到湿地松上取食对其生长发育与繁殖是不利的。

Effect of alternative hosts on the growth and development of massion pine caterpillar,Dendrolimus punctatus

Pinus massoniana Lamb and Pinus elliottii Engelm are two main pines in southern China.The growth and development of masson pine caterpillar Dendrolimus punctatus Walker fed with pine leaves of two pines and with shifting leaves from the P.massoniana to the P.elliottii were examined during larval stage in laboratory.Significantly shorter development duration,greater mortality and pupation rate,and higher body weight and cocoon weight were observed in the higher instar larva than in the younger larva when they rearing with leaves from the P.massoniana to the P.elliottii.Moreover,the masson pine caterpillar have shorter developmental duration,lower mortality,higher larva body weight,cocoon weight and higher egg-laying rate when rearing with P.massoniana leaves than rearing with P.elliottii leaves.The results showed the development of massion pine caterpillar was disadvantagous when they first feed on P.massoniana and then move to P.elliottii leaves.