It is difficult to ascertain the acreage in this district. Taking the figures of the census of 1900 and those of a canvass made by this Station in the winter of 1906-7 the acreage in the several counties is about as follows: Yates, 7940; Steuben, 5570; Ontario, 2630; Schuyler, 1014; Seneca, 1540; total 18,694. These figures are slightly larger than the estimates of grape-growers and buyers but chiefly so because they take in scattered plantations throughout the several counties. Thus in all of these counties there are a surprisingly large number of Niagara vineyards in out-of-the-way places, set during the Niagara boom of the eighties. To this Central Lakes district might also be added 500 acres of commercial vineyards in Livingston County; 250 in Cayuga and 250 in Tompkins Counties. The total valuation of the crop in this district in 1900 was $943,964. Insects are not as troublesome in the Central Lakes district as in the Chautauqua district. The grape-vine fidia, or root-worm, one of the worst of the insect pests of the grape, is not yet destructive in this region. The grape leaf-hopper and the grape-vine flea-beetle are possibly the worst of the insects infesting the grapes about these lakes. But fungi are more troublesome than in the Chautauqua district; probably because the climatic conditions are more favorable to the development of these pests about these smaller lakes than near Lake Erie. The five most troublesome diseases, named about in order of importance are black-rot,[106] downy mildew,[107] or "brown-rot", powdery mildew,[108] anthracnose,[109] or "bird's-eye rot" and chlorosis,[110] or "yellow-leaf". Vineyards are very generally sprayed in this district and usually with satisfactory results. Grape-growers have learned that certain varieties are much more susceptible to some of the diseases than others and plant accordingly. HUDSON RIVER DISTRICT. The region along the Hudson River forms the third largest grape district in New York. According to the census of 1890 there were 13,000 acres of grapes in this district but in 1900 the returns gave less than half that acreage. The great falling off was due to the taking out of a considerable number of old vineyards which had been planted with too many varieties, or with worthless varieties, or in some other respect were poorly set plantations. It is doubtful whether the acreage in 1907 is greater than in 1900 but the industry is in a more healthful and prosperous condition now than then.