324 



Bulletin 263. 



further information regarding the manifestations of the disease ; and third, 

 to suggest such preventive measures as seem most hkely to be of value.^ 



VARIETIES AFFECTED 



In the Chautauqua belt, it is naturally the Concord that is most often 

 afifected. The disease has been seen in Niagaras, Moore's Early, Aga- 

 wams, Pockliugtons, Wordens, Lindleys, Isabellas, Catawbas, and White 

 Scuppernong, the latter from Georgia. 



DISTRIBUTION 



There seems little doubt but that this disease is the one described by 

 Selby and Van Hook ('07) as localized stem blight. At the time circular 

 64 was written, in February 1907, the disease was known for only two 



localities in Ohio, namely at Unionville, 

 Ashtabula County, and at the Experi- 

 ment Station vineyard at Wooster. 



Mr. E. L. Worsham sent the writer 

 material from Atlanta, Georgia, under 

 date of May 6, 1907, and from this the 

 fungus causing the disease was readily 

 isolated. This was on white Scupper- 

 nong. Prof. H. H. Whetzel, of this de- 

 partment, collected specimens of the dis- 

 ease in Noble County, Indiana, May, 

 1904. Erie County, Pa., Port Hope, On- 

 tario, Canada, and California may be 

 admitted as doubtful sections. 



In New York, the disease is widely 

 distributed in the Chautauqua belt. 

 There, it is particularly destructive to 

 young vines, but is also present in old 

 vineyards where it seems to do less 

 damage. The writer has collected or received specimens from Westfield, 

 Brocton, Fredonia, Dunkirk, Silver Creek, Sheridan, Irving, and other 

 places. In the " Niagara Triangle " it has been received or collected 

 from near Hemlock, Romulus, Kendaia, Interlaken, Port Byron. Syracuse, 

 Baldwinsville, Canandaigua Lake, and others. From the Keuka Lake 



Photo July 20, 1908 



Fig. 41. — Vine trimmed and tied 

 but failed to put out shoots 



^The writer is especially desirous of obtaining information frorn as many sources 

 as possible, and solicits specimens as well as observations regarding the 



disease. 

 ('07) Selbv, A. D. & Van Hook, J. M. Dyin<? of bearing grapevines. Localized 



stem blight in Ohio vineyards, Ohio Agr. Exp. Sta. Circ. 64:1-6, Feb. 15, 1907. 



