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Pesticide Toxicology Laboratory

ISU Entomology / Pesticide Toxicology Laboratory / Prey-mediated effects of CryIA(b) toxin and protoxin and CryIIA protoxin on the predator Chrysoperla carnea

Prey-mediated effects of CryIA(b) toxin and protoxin and CryIIA protoxin on the predator Chrysoperla carnea

Authors: Hilbeck, A., Moar, W.J., Pusztai-Carey, M., Fillippini, A., Bigler, F.
Journal, Volume, Year: Entomologia Experimentalis et Applicata, volume 91:305-316, 1999
Summary

The objectives of this research were to 1) compare prey-mediated effects of CryIAb toxin-containing diet on mortality and developmental time of Chrysoperla carnea larvae to previous studies (Hilbeck et al., 1998a, 1998b), 2) determine if prey-mediated effects could be observed when protoxins of CryIAb and CryIIA were incorporated into prey diet, and 3) determine if differing concentrations in the artificial diet for the herbivorous prey would result in differences of C. carnea mortality rates and development times. Total immature mortality for chrysopid larvae reared in Bt-fed prey was always higher than controls. Total developmental time of C. carnea was not consistently affected by the Bt treatments except at the highest concentration of CryIAb toxin.

Comments

Mortality and development of C. carnea raised on 100 ug/g CryIAb toxin diet-fed prey may have been confounded by an increased intoxication of Spodoptera littoralis at that concentration. Chrysopid larvae were not given a choice in diet, which it has in a field setting. See additional papers by Hilbeck et al. (1998a, 1998b).