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ARS Home » Southeast Area » Stoneville, Mississippi » Southern Insect Management Research » Research » Publications at this Location » Publication #177838
Title: Enhanced Bt Toxicity by Avidin and Proteinase Inhibitors Against the Bollworm Helicoverpa zea

Author
item Zhu, Yu Cheng
item Adamczyk, John
item West, Sandra

Submitted to: Meeting Abstract
Publication Type: Other
Publication Acceptance Date: 2/22/2005
Publication Date: 2/22/2005
Citation: Zhu, Y., Adamczyk Jr, J.J., West, S.J. 2005. Enhanced Bt Toxicity by Avidin and Proteinase Inhibitors Against the Bollworm Helicoverpa zea. Meeting Abstract. Mississippi Agricultural Pest Management Association Conference. February 2005.

Interpretive Summary:

Technical Abstract: Bt toxicity was significantly enhanced by incorporation of sublethal dose of avidin or proteinase inhibitor into Bt diet. Treatment of diet with 10 ng/ml Bt and 10 ppm avidin increased larval mortality by 50%, and treatment of diet with 20 ng/ml Bt and 10 ppm avidin increased larval mortality by 57%. Synergistic effect of Bt and proteinase inhibitors caused significant decreases in larval body weight and length over time. General, tryptic, and chymotrypsin-like proteinase activities were significantly suppressed by Bt+inhibitor treatments.