Acta Entomologica Sinica (2004) 47, 461-466
Xiao-Xia Liu, Qing-Wen Zhang, Qing-Nian Cai, Jian-Cheng Li and Jie Dong (2004)
[Effect of Bt protein on development of different strains of the cotton bollworm, Helicoverpa armigera (Hübner) and the parasitoid, Microplitis mediator (Haliday)]
Acta Entomologica Sinica 47 (4), 461-466
Abstract: Two strains of the cotton bollworm, Helicoverpa armigera (Hübner), one a susceptible laboratory strain and the other one collected from Bt cotton fields, were used as hosts to study the effect of Bt insecticidal protein on the development of the parasitoid, Microplitis mediator (Haliday) . The results showed that the larval duration of the parasitoid was delayed, and the pupal weight, body- weight of the newly emerged adult and adult longevity decreased significantly when the hosts larvae were fed on a diet containing the Bt protoxin Cry1Ac at the concentrations of 0.5-8.0 µg/g continuously or between 12h before parasitism untill pupation of the parasitoid. Compared with the control, the larval weight and pupal weight of H. armigera decreased significantly when the larvae were fed on a diet containing cry1Ac . The pupation rate of H. armigera decreased significantly in the treatment with the diet containing Cry1Ac at 4.0 pg/g. When H. armigera larvae were fed on transgenic cotton leaves expressing both Cry1A and CpTI proteins, the mortality of the laboratory strain was 48.5% - 95.8% 2 - 5 days after treatment, which was significantly higher than that for the field strain (30.9%-86.1%). It is concluded that feeding on a diet containing Bt insecticidal protein, both strains of the cotton bollworm will have significantly negative effects on development of the parasitoid, M. mediator.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Xiao-Xia Liu, Qing-Nian Cai, Jiancheng Li
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation
