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Nature

Grape Tube Galls

Grape Tube galls - Schizomyia viticola
Richard Crook [CC BY-NC-SA 2.0] via Flickr
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Grape Tube galls - Schizomyia viticola

Some hikers in the Blue Ridge Mountains find grape leaves with some red, spikey growths. These Grape Tube galls are caused by parasites.