Monarch Milkweed Math

Mating Monarch Butterflies

John Pleasants* estimates the numbers of milkweed plants lost to changes in agricultural practices and the extent of the conservation effort required to replace them. Almost 900 million milkweed plants have been lost from corn and soybean fields (mostly) and from grassland conversion to crops. The decline from 1999 to 2014 is about 40%, from 2.2 billion to 1.3 billion milkweed plants. Plants in corn and soybean fields can produce more monarchs than plants in other…

Source: Living With Insects Blog

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