background preloader

Résistance naturelle

Facebook Twitter

OGM : selon Monsanto, une modification génétique peut en cacher une.


Super mauvaises herbes / Superweeds. Roundup-ready, aim, spray: How GM crops lead to herbicide addiction. To understand the environmental effects of GMOs, I started by looking at plants genetically modified to be insect-resistant — and concluded that they have, on balance, helped reduce overall insecticide use in U.S. farming.

Roundup-ready, aim, spray: How GM crops lead to herbicide addiction

The picture isn’t so rosy with the other main trait that GM agribusiness promotes, herbicide tolerance. While it’s clear that genetic engineering has reduced the amount of insecticides that farmers spray, it’s just as clear that it has encouraged a much larger increase in the use of the herbicide glyphosate. And while insect resistance is safeguarded by some (insufficient) regulations, there are no regulations to rein in the way that herbicide-tolerant plants encourage overuse of herbicides. If insect-resistant plants have helped run the pesticide treadmill in reverse, as entomologist Bruce Tabashnik told me, herbicide tolerant plants are running it forward at full speed, increasing our reliance on harmful chemicals. Why did GM lead to greater herbicide use? Monsanto Is Losing the Press. Ah, high summer.

Monsanto Is Losing the Press

Time to read stories about the declining effectiveness of GMO-seed giant Monsanto's flagship products: crops engineered to resist insects and withstand herbicides. Back in 2008, I felt a bit lonely participating in this annual rite—it was mainly just me and reporters in the Big Ag trade press. Over the past couple of years, though, it has gone mainstream. Here's NPR's star agriculture reporter Dan Charles, on corn farmers' agrichemically charged reaction to the rise of an insect that has come to thumb its nose at Monsanto's once-vaunted Bt corn, engineered to contain the bug-killing gene of a bacteria called Bacillus thuringiensis: It appears that farmers have gotten part of the message: Biotechnology alone will not solve their rootworm problems.

And this, from a veteran observer of the GMO-seed industry who—in my view—sometimes errs on the side of being too soft on it. Food and Water Watch There's also evidence that farmers lack access to lower-priced [non-GM] seeds. OGM : la fin du rêve Monsanto en Inde ? Diplômé du CFJ, il a travaillé à Europe 1, France 2 et France Info, avant de participer à la création de FRANCE 24 en 2006, en tant que présentateur de la matinale et du débat.

OGM : la fin du rêve Monsanto en Inde ?

Depuis 2011, il est directeur de l'Académie France 24-MCD-RFI. Chemical creep: Farmers return to pesticides as GMO corn loses bug resistance. Monsanto’s Bt corn was supposed to reduce pesticide use.

Chemical creep: Farmers return to pesticides as GMO corn loses bug resistance

The Environmental Protection Agency said as much when the corn, which is genetically modified to resist the crop-ravaging rootworm, debuted in 2003. Sure enough, as more farmers sowed their fields with Bt corn, fewer of them needed to spray pesticides to protect their crops. The share of U.S. corn acreage treated with insecticides fell from 25 percent in 2005 to 9 percent in 2010. Coton bt regulation biologique. Superinsects Are Thriving in This Summer's Drought. This summer, a severe drought and genetically modified crops are delivering a one-two punch to US crops.

Superinsects Are Thriving in This Summer's Drought

Across the farm country, years of reliance on Monsanto's Roundup Ready corn and soy seeds—engineered for resistance to Monsanto's Roundup herbicide—have given rise to a veritable plague of Roundup-resistant weeds. Meanwhile, Monsanto's other blockbuster genetically modified trait—the toxic gene of the pesticidal bacteria Bt—is also beginning to lose effectiveness, imperiling crops even as they're already bedeviled by drought.

Last year, I reported on Bt-resistant western rootworms munching on Bt-engineered corn in isolated counties in Minnesota, Iowa, and Illinois. This summer, resistant rootworms are back like the next installment of a superhero blockbuster movie franchise. Last week, Minnesota Public Radio reporter Mark Steil filed a report on a workshop on Bt-resistant rootworms at which Potter spoke. Here's how Steil describes the interaction between drought and rootworms: La naturaleza se rebela contra el gigante de los cultivos transgénicos Monsanto. Unos escarabajos parásitos pueden consumir el maíz modificado genéticamente sin sufrir el menor daño, según revela un trabajo de investigación publicado en el último número de la revista GM Crops & Food.

La naturaleza se rebela contra el gigante de los cultivos transgénicos Monsanto

Una muestra de la población del escarabajo de 2010 tiene una tasa de supervivencia 11 veces mayor que la de la población de control. Eso es ocho veces más que el año anterior, cuando por primera vez se identificó a esta especie resistente. El año pasado, el investigador Aaron Gassmann, de la Universidad de Iowa, señaló que varios agricultores habían descubierto que un gran número de escarabajos sobrevivía después del consumo de los cultivos transgénicos. Gassmann llamó a estos insectos ‘superbichos’. Los hallazgos recientes pueden tener consecuencias devastadoras, tanto para los agricultores como para los consumidores. Monsanto lanzó su maíz transgénico con la proteína especial insertada en su código genético en 2003.