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July 3, 2008 | 6 comments
Unwelcome Immigrants: Can the U.S. Thwart Asian Moths?
The Asian cousins of North America's tree-munching gypsy moths are crossing the Pacific on cargo ships and could establish a beachhead in the U.S.
By Julia C. Mead
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CLICK TO ENLARGE + Photo courtesy USDA
INVASIVE PESTS: The gypsy moth caterpillar defoliates forests and kills trees around the world. This photo shows two varieties of adult gypsy moths. Females of the Asian variety [top row, with female on the left] can fly, whereas North American females can't. U.S. scientists are worried that, if introduced here, the Asian moths might breed with the local population and accelerate the expansion of the gypsy moth's range. Note the longer, broader wings on the Asian female, compared with those of the North American strain [bottom row, female on left].
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