. rig. 30.—Bunch mold of grapes. has been found of preventing the development of mold in bunches of grapes on the vine. California Vine Disease, Pierce's Disease.—In this disease, appar- ently caused by a virus, the vines gradually weaken, the growth becomes short, dieback of the canes develops, and the whole vine soon dies for no obvious reason. In some varieties there is a yellowing between the veins of the leaves and the fruit withers and dries in summer. The disease spreads in the vineyard. This trouble, which has become rather serious in certain districts during the last seven years, rese
. rig. 30.—Bunch mold of grapes. has been found of preventing the development of mold in bunches of grapes on the vine. California Vine Disease, Pierce's Disease.—In this disease, appar- ently caused by a virus, the vines gradually weaken, the growth becomes short, dieback of the canes develops, and the whole vine soon dies for no obvious reason. In some varieties there is a yellowing between the veins of the leaves and the fruit withers and dries in summer. The disease spreads in the vineyard. This trouble, which has become rather serious in certain districts during the last seven years, resembles the disease which caused widespread destruction of vines in southern California'' and in the Santa Clara Valley almost fifty years ago. Affected vines should be removed when the first symptoms are seen. Replants in the same places do not seem to contract the disease. Coulure, Shelling.—In certain varieties, notably Muscat, many of the flowers fail to set fruit, which results in the production of poorly filled bunches. This may be due in part to poor pollination or fruit setting 18 Pierce Newton B. The California vine disease. U. S. Dept. Agr. Div. Veg. Path. Bill. 2:1-222. 25 pi. 1892.
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