In 1869, a French entomologist trying to breed a hardier silkworm let a batch of moth larvae escape his Massachusetts yard. Twenty years later they had defoliated 360 square miles nearby, and the species can still strip a million acres in a single bad year. - spacedaily.com
Source:Space Daily
A single escaped silkworm colony became North America’s costliest forest pest—but no one noticed the catastrophe unfolding for two decades.
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