Limits sought on weed killer glyphosate to help monarch butterflies

By Louis Sahagun, Los Angeles Times

With monarch butterfly populations rapidly dwindling, a conservation organization on Monday asked the U.S. Environmental Protection Agency to implement tougher rules for the weed killer glyphosate — first marketed under the brand name Roundup — to save America’s most beloved insect from further decline.

In a petition, the Natural Resources Defense Council argued that current uses of glyphosate are wiping out milkweed, the only plant upon which monarch caterpillars feed. The loss of milkweed is having a devastating effect on the life cycles of the large, fragile orange-and-black butterflies, which migrate through the United States, Canada and Mexico.

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