Today, it chews its way through thousands of square kilometers of greenery in the north-east of the US each year, putting up to 300 different species of tree and shrub at risk. In the past half a century alone the gypsy moth grub defoliated more than 83 million acres of forest in a range that now extends from the Atlantic coast to the centre of Wisconsin..
What started as a small-time hobby rapidly became an industry-scale enterprise. By the end of the Civil War in 1865, Trouvelot claimed to be feeding a million young silkworms on five acres of woodland in his backyard. Precisely how Trouvelot's sample of gypsy moth larvae came to America isn't clear. Nor does it really matter. Critically, some time around 1867, Trouvelot began experimenting with the insect inside his Medford home. And, by at least one account, outside of it.
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