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The researchers found that the insect with the second-highest number of plant hosts is the fall webworm, a moth that is known to feed on 636 different plant species.

Likewise, American species are wreaking havoc abroad, including the fall webworm, which devastates thousands of acres of forest in China each year.

Field tests are being made in several countries: in France and Germany against larvae of the cabbage butterfly, in Yugoslavia against the fall webworm, in the Soviet Union against a tent caterpillar.