两种赤眼蜂对小菜蛾卵的寄生潜能分析

应用生命表技术分析了拟澳洲赤眼蜂Trichogramma confusum Viggiani(T.c)和卷蛾分索赤眼蜂Trichogramm-atoidea bactrae Nagaraja(T.b)在两种繁蜂条件组配下（分别用米蛾Corcyra cephalomica(Stainton)(RM)卵和小菜蛾Plutella xylostella(L.)(DBM)卵繁育）对小菜蛾卵的寄生潜能分析，结果表明：（1）在相同寄主繁蜂条件下，卷蛾分索赤眼蜂在小菜蛾卵上显示出较强的寄生潜能，米蛾卵上所繁的卷蛾分索赤眼蜂（T.b-RM)和小菜蛾卵上所繁的卷蛾分索赤眼蜂（T.b-DBM)的内禀增长率为0.3509和0.3450，而米蛾卵上所繁的澳洲赤眼蜂（T.c-RM)和小菜蛾卵上所繁的拟澳洲赤眼蜂（T.c-DBM)的仅为0.2391和0.1902,T.b-RM和T.b-DBM的每雌平均寄生卵数为70.75和46.13粒，而T.c-RM和T.c-DBM的仅为64.90和31.73粒，但拟澳洲赤眼蜂的雌蜂寿命较卷蛾分索赤眼蜂更长。（2）在不同寄主繁蜂条件下，同种赤眼蜂对小菜蛾卵的寄生潜能以米蛾卵所繁的仔蜂的各项寄生特性参数（内禀增长率，每雌寄生卵量，净生殖力，平均世代历期和雌蜂寿命）均优于用小菜蛾卵所繁之蜂，米蛾卵是其适宜的中间寄主。（3）长期用中间寄主繁蜂，赤眼蜂对目标寄主表现出一定的不适应性，中间寄主的驯化对赤眼蜂的寄生潜能有不容忽视的削弱作用。

Analysis of the Reproductive Potential of Two Trichogramma Species on the Eggs of Diamondback Moth

The reproductive potential of two Trichogramma species females, Trichogramma confusum Viggiani ( T.c ) and Trichogrammatoid bactrae Nagaraja ( T.b ), developed in the eggs of diamondback moth (DBM), Plutella xylostella (L.)( T.c \|DBM and T.b \|DBM) were compared with those developed in the eggs of rice moth (RM), Corcyra cephalomica (T.c \|RM and T.b \|RM) by rearing with diamondback moth (DBM) eggs with the method of life table. The results showed:(1) When developed in the same host, T.b showed a higher reproductive potential on DBM eggs, the intrinsic rate of natural increase ( r\-m ) of T.b \|RM and T.b \|DBM were 0\^3509 and 0\^3450 respectively, while T.c \|RM and T.c \|DBM's were 0\^2391 and 0\^1902, respectively; T.b \|RM and T.b \|DBM laid 70\^75 and 46\^13 eggs per female, respectively, while T.c \|RM and T.c \|DBM only laid 64\^90 and 31\^73 per female respectively. However, the female adults' longevity of T.c was longer than that of T.b. (2) Reproductive properties parameters ( r\-m , number of eggs laid per female, the net reproduction rate, the longevity of female adult) of T.c \|RM and T.b \|RM were more ideal than those of T.c \|DBM and T.b \|DBM, the Corcyra cephalomica eggs were suitable alternative hosts for these two Trichogramma species. (3) The reproductive potential of T.b would be weakened on its target hosts when developed in alternative hosts continuously.