Bacillus thuringiensis (Bt) là một cách tự nhiên xảy ra vi khuẩn đất sản xuất protein hoạt động chống lại côn trùng nhất định. Bắt đầu từ giữa những năm 1990, cây trồng thể hiện gen Bt đã được thương mại hóa vào Hoa Kỳ. Cry1Ab và Bt Cry1F ngô có hiệu quả trong việc kiểm soát sâu bệnh nhất định ngô (sâu đục thân ngô châu Âu, ngô earworm sâu đục bắp và tây nam), và Bông Bt Cry1Ac có hiệu quả trong việc kiểm soát một số sâu hại bông (thuốc lá budworm, sâu đục quả và sâu đục quả bông màu hồng). Ngoài những lợi ích kinh tế cho. | FEAT UR E Are Bt crops safe Mike Mendelsohn John Kough Zigfridais Vaituzis Keith Matthews The US EPA s analysis of Bt crops finds that they pose no significant risk to the environment or to human health. Bacillus thuringiensis Bt is a naturally occurring soil bacterium that produces proteins active against certain insects. Beginning in the mid-1990s crop plants expressing Bt genes were commercialized in the United States. Cry1Ab and Cry1F Bt corn are effective in controlling certain pests of corn European corn borer corn earworm and southwestern corn borer and Cry1Ac Bt cotton is effective in controlling certain pests of cotton tobacco budworm cotton bollworm and pink bollworm . Beyond the economic benefits to growers the use of Bt corn and Bt cotton result in less risk to human health and the environment than chemical alternatives. In 2001 the US Environmental Protection Agency EPA Washington DC USA reassessed the four still registered but expiring Bt crops that had been accepted for agricultural use in the preceding six years from 1995 to October 2001 Table 1 . The Bt crop reassessment approvals included provisions to prevent gene flow from Bt cotton to weedy relatives increase research data on potential environmental effects and strengthen insect resistance management. From this reassessment the EPA has determined that Bt corn and Bt cotton do not pose unreasonable risks to human health or to the environment. In this article we summarize the supporting data and conclusions of the EPA. The complete reassessment document1 Biopesticides Registration Action Document BRAD Bacillus thuringiensis Plant-Incorporated Protectants which describes in detail the reassessment process along with extensive references can be found on the EPA website at http pesticides biopesticides pips . Federal oversight of Bt crops Consistent with the Coordinated Framework for Regulation of Biotechnology Mike Mendelsohn John Kough and Zigfridais Vaituzis are in the .
