Secret Gardener

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Sharp Decline of the Monarch Butterfly

A new census found this winter’s population of North American monarch butterflies in Mexico was at the lowest level ever measured. University of Kansas insect ecologist Orley R. Taylor talks to Yale Environment 360 about how the planting of genetically modified crops and the resulting use of herbicides has contributed to the monarchs’ decline.

Taylor talked about the factors that have led to the sharp drop in the monarch population. Among them is the increased planting of genetically modified corn in the U.S. Midwest, which has led to greater use of herbicides, which in turn kills the milkweed that is a prime food source for the butterflies.

“What we’re seeing here in the United States,” he said, “is a very precipitous decline of monarchs that’s coincident with the adoption of Roundup-ready corn and soybeans.
The glyphosate used in agriculture has tripled since 1997, when they…

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