232 MANUAL OF FRUIT DISEASES 
The name black-rot, which is in use in America and Europe, 
applies to the condition of affected grapes (Fig. 59). When the 
berries are about one-half grown, the disease shows its first 
symptoms in the form of a blanching. This is soon re- 
placed by a whitening 
of the diseased area, 
which is now more evi- 
dent. A brownish line 
appears at the margin, 
and there results, on ac- 
count of a light-colored 
circular disk with an 
encircling darker band, 
a bird’s-eye effect. 
Some grape-culturists 
confuse this stage with 
the true bird’s-eye, or 
anthracnose, described 
on page 250. The spot 
increases in size rapidly 
and its surface becomes 
sunken. Ina few hours 
after the beginning of 
the development of the 
lesion, numerous minute 
brown specks appear on 
the light-colored center. 
Fic. 59. — Black-rot on grape berries. These are the fruiting 
oe bodies of the black-rot 
organism, which very shortly become so numerous as to give 
the spot a blackish aspect. Occasionally the extent of the 
lesion is halted, and in a few days there is formed a thin black 
superficial crust on the side of the berry. The usual course of 
development, however, is for the berry to become entirely in- 
