摘要
稻虱缨小蜂Anagrus nilaparvatae Pang & Wang对白背飞虱Sogatella furcifera(Horváth)卵龄无明显的寄生选择性,但在新鲜寄主中的发育历期较短,育出的蜂体较大,生殖力较高,而弱化率和雌雄性比则不受寄主卵龄的影响。在白背飞虱和褐飞虱Nilaparvata lugens(Stl)卵共存时,稻虱缨小蜂明显选择褐飞虱。稻虱缨小蜂在褐飞虱卵中的发育显著地比在白背飞虱卵中的慢;褐飞虱卵育出的蜂的初羽化成虫怀卵量显著高于白背飞虱卵育出的,虫体大小也类似,且虫体越大,生殖力越高。从白背飞虱卵育出的蜂供给白背飞虱卵(W→W)时,产卵量低于其它育蜂寄主和供给产卵寄主组合(W→B、B→B、B→W)的,其内禀增长力r_m较其余者小25％。本文还讨论了应用适宜性指数来综合衡量寄主的适宜性。
Host age preference and effect of host age on development and reproduction of nilaparvatae Pang & Wang, a mymarid egg psrssitoid of planthoppers, were studied in 'he laboratory with constant temperature 23→. This parasitoid showed no distinct imposition pre-ference to eggs of different ages of the white-backed planchopper (WBPH) Sogatella furcifera (Horvath) as judged with the method of Manly (1972). However, as the age of host egg increased, its developmental period lengthened and the body size and fecundity of the issuing wasp decreased. The sex ratio and emergence rate of the offsprings were not affected by host age. For the adult the larger the body size, the higher the fecundity.This parasitoid obviously preferred eggs of brown planthopper (BPH) Nilaparvata lugens (Stal) to that of WBPH when both were present. Body size and fecundity were greater in the issuing females from BPH eggs than in those from WBPH eggs. They developed slower in BPH eggs. The effect of different combinations of its original host and host eggs offered for oviposition were compared, and it was found that the female wasps which were raised from WBPH eggs and offered with WBPH eggs (i.e. WBPH→WBPH) produced fewer progtny than other combinations (i.e. WBPH→BPH, BPH→WBPH and BPH→BPH). The intrinsic rate of increase (rm) of this parasitoid with WBPH→WBPH was only 75% of that with other combinations. Assessment of host suitability for parasitoids by using suitability index (SI) is discussed.
出处
《昆虫学报》
CAS
CSCD
北大核心
1993年第4期430-437,共8页
Acta Entomologica Sinica
基金
国家自然科学基金
关键词
稻虱缨小蜂
白背飞虱
褐飞虱
Anagrus nilaparvatae-Sogatella furcifera-Nilaparvata lugens-hest preference-host suitability index
