摘要
研究表明,棉蚜茧蜂[Lysiphlebia japonica(Ashmead)]喜好寄生棉蚜2、3龄若蚜,寄生率分别为78.8％和87.2％;对4龄若蚜的寄生率为10.6％;1龄若蚜的寄生率仅为5％;棉蚜茧蜂一般不选择有翅蚜作为寄主。随着供蚜量的增加,未被寄生的蚜虫百分率从21.3％上升至63％;过寄生率从55.1％下降至8.37％;废卵率从53.1％降至7.9％。棉蚜茧蜂对健康棉蚜和被寄生过的棉蚜不能完全识别,存在过寄生现象。
The parasitization preferences of Lysiphlebia japonica (Ashmead) to different instars of Aphis gossypii were studied. The results showed that the parasitization rates of the 2nd, 3rd and 4th instars of aphid's nymphs by L. japonica were 78. 8% , 87. 2% and 10. 6% , respectively. Meanwhile, alate aphids weren' t normally selected as hosts. As aphids increased, the rate of nonparasitized aphids increased from 21.3% to 63% , and the rate of superparasitized aphids dacreased from 55.1% to 8.37%, while the rate of useless eggs of wasps decreased from 53.1 % to 7. 9% . It was concluded that L. japonica preferred the 2nd and 3rd instars of the aphids, and the female wasps didn' t distinguish the parasitized aphids from intact aphids when laying eggs in aphids, which resulted in superparasitism.
出处
《植物保护》
CAS
CSCD
北大核心
2004年第6期37-39,共3页
Plant Protection
关键词
棉蚜
蚜茧蜂
寄生率
虫态
有翅蚜
选择
寄主
寄生现象
百分率
pest bio-control
Lysiphlebia japonica (Ashmead)
rate of patasitization
superparasitism
