High levels of resistance to two Bt proteins in GM maize of the African stem borer have been detected in three production regions in South Africa. […]
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GM Bt cotton is failing in India – and African countries should take note of this when considering whether to introduce it themselves, according to a new scientific paper. […] This study on Bt cotton farms in Karnataka found that yield sensitivity to pest pressure increased in the second decade of adoption, resulting in losses in some years. […] GM Bt crops are losing their effectiveness as pest resistance to the Bt toxin insecticides has increased. […] 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. […] 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 […] |
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