GRAPE-LEAF BLIGHT. 
Cercospora viticola (Saccardo). 
Lower and more shaded leaves more or less thickly covered ve 
with rounded or irregular brown spots, varying in size from one- 
twenty-fourth to one-eighth of an inch in diameter, with aclearly — 
defined darker colored and slightly thickened or elevated border. 
The discolorations extended through the thickness of the leaf, but _ 
while the diseased areas on the upper surface were perfectly — 
smooth there could be seen, with the aid of a pocket lens, on the 
under side numerous projecting hair-like points. As the disease ~ 
progresses the tissues of the leaf in the vicinity of the spots 
becomes affected, changing to a pale green or yellow, and finally 
the whole leaf perishes. 
This blight, when prevalent, may cause considerable damage to 
the foliage, and consequently to the vine, but unless the season 
be a very wet one, it is not likely to do much damage, except, 
perhaps, in lower or damp situations or upon vines improperly 
cared for. 
The form of this fungus above described is the only stage in its 
development yet known. . 
No remedies are known for either the “leaf-blight” or “ leaf- 
spot” diseases, but it is very probable that the general treatment 
advocated for the downy mildew and anthracnose will have a 
direct tendency to limit their development. 
Waitt Rot. 
Like the black-rot fungus, this produces minute pycnidia or 
spore conceptacles, which appear at the moment when the berries 
commence to ripen. These lie just beneath the cuticle, through 
which they finally burst, first appearing as shining rosy points, 
then white, and finally brown. When fully ‘developed, the 
pycnidia are surrounded by a thin membrane of a rather dark 
brown color. The ovid spores are borne upon slender stalks or 
basidia, either simple or branched, which spring from a layer of 
very delicate tissue occupying the lower part of the pycenidum. 
No remedy is known for white rot, but it has been observed 
here, and very generally treated in France, that where the vine- 
yards have been treated with eau celeste, or the Bordeaux 
mixture, the disease was far less prevalent than in similarly 
located vineyards not treated. 
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