Insect and Fungous Enemies of the Grape. 
confused with other diseases. 
such as ripe-rot and black- 
rot. It is most frequently 
found in the Southern States 
and is not usually serious 
enough to need special treat- 
ment. 
Treatment.—Spraying as 
directed for black-rot’ will 
probably prevent this dis- 
ease. 
WHITE-ROT. 
The effect of the disease 
known as_ white-rot** upon 
the fruit of*the grape is 
somewhat similar to that of 
the brown-rot form of the 
downy mildew. It is fre- 
quently confused with ripe- 
rot. It occurs in Missouri 
and the Southwest, but has 
not yet been found sufficiently 
destructive to need special 
treatment. 
ROOT-ROTS. 
The roots of the grape are 
known to be attacked by sev- 
eral different fungi, espe- 
cially when the root system 
has become weakened or in- 
jured by other causes. Only 
two forms of root-rot are of 
sufficient importance to be 
mentioned here. 
VIBRISSEA ROT. 
The vibrissea rot** is usu- 
ally associated with insect in- 
jury, due either to Phyl- 
loxera or to the grape ‘root- 
worm. It has been found 
37 Caused by Coniothyrium diplodi- 
ella (Speg.) Sace. 
388 Caused by Vibrissea hypogaea Ch. 
Richon & Le Monnier. 
Fic. 70.—Crown gall on Concord grapes. 
numerous wart-like galls are mostly produced 
on the main stem 
Eastern yineyards. 
and larger 
branches 
63 
The 
in 
