Some Grape Troubles of Western New York. 447 



advanced at the time the fungus attacks them they turn brown , 

 which has given rise to the name of brown rot, and the gray ap- 

 pearance is not always present. Figure 6 shows two clusters of 

 Niagara grapes attacked early in the season. 



Fig. 6. — Young Niagara clusters attacked by brown or gray rot. 



The leaves and young shoots also suffer early in the year but 

 the worst time for ihem appears to be during July. Still I have 

 seen comparatively fresh growth of the fungus as late as October, 

 so that there is danger from the disease so long as there are green 

 portions upon the vine. The fruiting portion of this fungus ap- 

 pears upon the under side of the leaves in the form of gray, downy 

 growths. Directly above these the upper side of the leaves show 

 yellow discolorations which soon turn brown as the afifected part 

 of the leaf dies. These areas are quite sharply defined, and the 

 entire leaf does not change color in consequence of such diseased 

 portions. 



