Bt Crops with Multiple Toxins Not As Effective As Assumed

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. […]

Natural Refuges and Pyramiding Toxins: Flawed Solutions to Pest Resistance in Bt Cotton

This commentary argues that the strategy of using natural refuges and pyramided Bt toxins to delay insect pest resistance to Bt cotton is flawed. […]

Fall Armyworm Shows High Resistance to Bt Maize in the U.S.

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. […]

Rootworm Resistance Emerges to Two Types of Bt Toxins in GM Maize

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. […]

Pest Resistance to Cry1Ab Bt Maize in South Africa

This paper traces the development of resistance of the African maize stem borer to Bt maize containing the toxin Cry1Ab, in South Africa. […]

Attempts to Prevent Pests Adapting to Bt Crops May Fail

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. […]

Aphids Attack GM Cotton

A recent study sheds new light on the problem of secondary pest emergence by establishing a link between the rise in aphids in Bt cotton and a weakened plant defence system. […]

Cry1Ac Protoxin from Bacillus thuringiensis sp. kurstaki HD73 Binds to Surface Proteins in the Mouse Small Intestine

This research report finds that Cry1Ac protoxin (pCry1Ac) binds to the mucosal surface of the mouse small intestine. […]