Bt toxins conferring insect resistance in GM plants can have adverse effects on non-target organisms in an aquatic ecosystem, whether singly on in combination with other Bt toxins, highlighting the importance of assessing combinatorial effects. […]
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The fall armyworm has developed resistance to two Bt maize strains in Brazil. So-called solutions such as stacked-trait Bt crops and gene-silencing are however unlikely to provide a lasting solution to pest resistance. […] A study published this year in Plant Biotechnology Journal focuses on the development and impacts of secondary pests on Bt crops. Insecticide spraying to deal with this problem would undermine the whole rationale for the introduction of Bt crops which was […] This article finds that Bt maize in South Africa has minimally benefitted small farmers and recommends instead the development of cheaper non-GM stress-tolerant maize varieties better suited to small-farm agroecology to ensure improved food security. […] A meta-analysis to assess the potential of Bt crops pyramided with two or more toxins to delay pest resistance development has found that the pyramids are less effective than assumed and that cross-resistance often occurs. […] This commentary argues that the strategy of using natural refuges and pyramided Bt toxins to delay insect pest resistance to Bt cotton is flawed. […] A new study has produced compelling evidence of resistance of fall armyworm in southeastern U.S. to maize genetically modified to kill them, posing a serious threat to the long-term sustainability of the technology. […] A recent discovery of resistance to a second type of Bt toxin in GM maize resistant to western corn rootworm underscores the lesson that even with GM crops, age-old farming practices such as crop rotation are still the better option to control pests. […] This paper traces the development of resistance of the African maize stem borer to Bt maize containing the toxin Cry1Ab, in South Africa. […] Recent research shows that the pyramid strategy (developed to deal with insect resistance to Bt crops) of genetically engineering crops to produce two or more toxins that kill the same pest, may not work. […] |
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