Herbicide-resistant genetically modified crops have brought the iconic monarch butterfly to the brink of extinction, according to a new report presented by the Center for Food Safety to Congress on Thursday.

The report, (pdf), is the most comprehensive look yet at how Monsanto’s ‘Roundup Ready’ crops have helped decimate the monarch population, which has declined by 90 percent in the past 20 years.

“This report is a wake-up call. This iconic species is on the verge of extinction because of Monsanto’s Roundup Ready crop system,” said Andrew Kimbrell, executive director at Center for Food Safety. “To let the monarch butterfly die out in order to allow Monsanto to sell its signature herbicide for a few more years is simply shameful.”

As Common Dreams has reported before, and the new study makes abundantly clear, a critical factor in the orange-and-white butterflies’ decline is the loss of host plants for larvae in their main breeding habitat, the Midwestern Corn Belt. Monarchs lay eggs exclusively on plants in the milkweed family, the only food their larvae will eat.

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