Grapevine Fanleaf (virus): Fanleaf is caused by a virus that also causes yellow mosaic and veinbanding. All three are transmitted by the nematode Xiphinema index. Leaf symptoms that resemble a fan are very conspicuous on Mission and French Colombard. Infected vines have shortened and more irregular internodes. Lateral sprout development, double nodes, and stem faciations cause a bushy appearance. Many berries shatter, and others do not develop beyond shot size. Diseased vines should be removed.

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