Early warning of field-evolved resistance of the corn earworm and bollworm to Bt toxin VIP3Aa, the only Bt toxin in transgenic corn and cotton that remains effective against some populations of this pest in the U.S. […]
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Monsanto data from 1990 reveal that Bt toxins expressed in GE plants can be up to 20 times more toxic than natural Bt toxins but this has thus far been ignored in risk assessments. […] In an effort to stave off above-ground insect resistance, the US EPA has proposed phasing out many current Bt corn hybrids, as well as some Bt cotton varieties, in the next three to five years. […] Entomologists across the South of the USA are reporting increased feeding and survival of the corn earworm/cotton bollworm in Bt corn and cotton fields expressing the Vip3A protein, once believed to be the final Bt stronghold against the pest. […] Studies are showing that insect resistance development can occur with pyramided Bt crops, diminishing their efficacy. […] Questions arise over claims made by the Water Efficient Maize for Africa Project that Bt maize is a solution to combat the fall armyworm pest. Instead, African governments are called to implement sustainable agroecological strategies to deal with the pest […] Monsanto has indefinitely cancelled its plans to introduce Intacta 2 Xtend, its second generation Bt soybean, in the U.S., most likely due to indications of insect resistance to the Bt proteins in the new product. […] Severe pink bollworm infestation has swept through the cotton-growing states of India due to evolved resistance to GM Bt cotton, which covers 90% of Indian cotton land. […] Cotton farmers across Texas are expected to face a growing bollworm problem this season with up to 40% crop losses reported last year due to increasing resistance of the bollworm to Bt cotton and Bt corn being grown in the southern states of the US. […] A study analyzing global patterns of field-evolved resistance to Bt crops over the last two decades has found that the number of cases of pest resistance to Bt proteins increased from 3 in 2005 to 16 in 2016. […] |
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