260 MANUAL OF FRUIT DISEASES 
Gregory, C. T. A rot of grapes caused by Cryptosporella viticola. 
Phytopath. 3: 20-238. 1913. 
Selby, A. D., and Van Hook, J. M. Dying of bearing grape-vines. 
Ohio Agr. Exp. Sta. Cire. 64: 1-6. 1907. 
Shear, C. L. The ascogenous form of the fungus causing dead-arm 
of the grape. Phytopath. 1:116-119. 1911. 
Warre-Rotr 
Caused by Coniothyrium diplodiella (Speg.) Sacc. 
It is probable that the pathogene causing white-rot is native to 
America, although it was first found in Italy about 1878. In 
1885 it was observed in France, and in 1887 considerable alarm 
was aroused because of white-rot. That same year the disease 
was first noted in America, having been found in southwestern 
Missouri and neighboring territory. Since its discovery in the 
United States the disease has appeared in Ohio and New York 
and the grape-growing regions of the Southwest. In recent 
years white-rot has been found in Algeria and Hungary. 
- White-rot is regarded as one of the less important of the 
grape diseases in America. It is not often serious, although it 
is said to do damage in some parts of Ohio. The amount of 
losses from white-rot is decidedly greater in European vine- 
yards than in those of this country. 
Symptoms. 
White-rot affects the fruit, young shoots, stems of berries, 
and rarely the foliage. 
Berries may or may not be directly affected. Generally the 
disease appears first on the fruit-stalks, as a result of which the 
berries wither and become dry. Berries affected directly show 
brown-rot lesions. The fruit becomes abnormally juicy, shrivels, 
and brownish pustules appear over the surface. Berries may 
be affected after maturity. In severe cases all fruits in a single 
bunch may be diseased. Eventually a dry mummy is produced, 
