Fungous malattie delle piante . igne.] 1: 101-184. 18S1 ; 2: 1-91. 1882.Farlow, W. G. Sul Grape-Vine americano di muffa. Costruite, Bussey istituzione (1876): 415-425. pis. 2-j.Relazione sulle esperienze fatte nel 1888 nel trattamento della peronospora e marciume nero del vitigno. Bot. Div., U. S. Dept. Agl. Costruito. 10: 1-61. 1889.ScRiBNER, F. L. Il Fungous Malattie del vitigno: I. la peronospora. Bot. Div., U. S. Dept. Agl. Costruito. 2 : 7-18. pis. /, 2, 4 (in parte). 1886.VlALA, P. Mildiou. Les maladies de la vigne (Cap. 2): 57-155- t^^- 2-3. Maschere di montaggio. 20-46. 1893. Montpellier et Parigi. Occ

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Fungous diseases of plants . igne.] 1: 101-184. 18S1 ; 2: 1-91. 1882.Farlow, W. G. On the American Grape-Vine Mildew. Built, of the Bussey Institution (1876): 415-425. pis. 2-j.Report on Experiments made in 1888 in the Treatment of the Downy Mildew and Black Rot of the Grape Vine. Bot. Div., U. S. Dept. Agl. Built. 10: 1-61. 1889.ScRiBNER, F. L. The Fungous Diseases of the Grape Vine: I. The Downy Mildew. Bot. Div., U. S. Dept. Agl. Built. 2 : 7-18. pis. /, 2, 4 (in part). 1886.VlALA, P. Mildiou. Les maladies de la vigne (Chap. 2): 57-155- t^^- 2-3. Jigs. 20-46. 1893. Montpellier et Paris. Occurrence. The downy mildew of the grape is one of themost important disease-producing organisms among the Pero-nosporaceae. The fungus seems to be of American origin, and PHYCOMYCETES 153 was at first probably more or less confined to the MississippiValley and states to the eastward. It has been known for along time as a pest in the Middle Atlantic States, extendingwestward to the Mississippi, but in the states farther to the. Fig. 52. Grape Leaf with Early Stage of Downy Mildew(Photograph by H. H. Whetzel) northeast, while equally common, it has been less disastrous inits effects. This is to be accounted for in part by the vigorousgrowth of the vine under more constant rainfall; but the greaterinjury farther west has been attributed particularly to the factthat the fungus appears earlier in the season. The disease was 154 FUNGOUS DISEASES OF PLANTS not known on the Pacific Slope during the early history ofgrape-growing in that region, but it is now not uncommon. Thefungus was apparently introduced into Europe from America, and it became a serious pest within a very short time after it wasfirst noted in that country. This greater injury under Europeanconditions had been predicted by Farlow on account of the earlyspring and the relatively slight growth which is made by Vifisvinifera, the cultivated grape of Europe. The grape mildew has been found abundantly on practically allspeci

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