CHAPTER XIIi 
DISEASES. 
Mitpew.—Nearly all attempts to cultivate the exotic 
grape-vine in the open air, in the United States, have 
ended in total failure and disappointment. In a few soli- 
tary instances, and under peculiar circumstances, where 
the excessive changes have been counteracted by shelter 
or otherwise, a partial success has been obtained, but the 
climate of the whole eastern and middle parts of the Union, 
the time of greatest activity—-when mildew in its various 
forms completes the works of destruction. This mildew 
is the growth of fungoid vegetation, the seeds of which 
are so small in many kinds as to be invisible to the naked 
eye. There are two kinds which are most troublesome to 
€ grape-vine—one, which we presume to be the Oidium 
Tuckeri, that is at EE devastating the vineyards of 
Europe; and the other a Botrytis, or some analogous 
first indication of the former is shown by 
the leaves having brown spots upon them, and which 
permeate quite through the tissue. Afterwards, are seen 
speedily destroyed, will soon extend to the fruit stalks, 
penetrate to the berries by the rhizoma or spawn, and 
make them in appearance like a diseased potato in — 
(43), 2 
