394 MANUAL OF FRUIT DISEASES 
September. Lesions show anywhere on the surface of the 
fruit, but are most numerous near the blossom-end. Here 
they frequently unite, forming one continuous blotch. The 
spots are one-fifth of an inch or less in diameter, their surface 
is slightly sunken, and the affected tissue firm. At first the 
diseased portion is a deeper green than the surrounding tissue. 
Later the lesions are black. In the center of each spot black 
specks — fruiting bodies of the pathogene — appear in great 
numbers. See fuller discussion of this disease under Apple, 
page 87. 
REFERENCES 
Brooks, Charles. Quince blotch and apple fruit spot. Phytopath. 3: 
249-250. 1913. 
Halsted, B. D. Some fungous diseases of the quince fruit. The 
quince blotch. New Jersey Agr. Exp. Sta. Bul. 91:13. 1892. 
Buack-Ror 
Caused by Physalospora Cydonie Arnaud 
The disease which is discussed under Apple (page 45) 
occurs on all pomaceous fruits, including the quince. The 
trouble manifests itself on quince almost entirely on the fruit 
and is referred to as black-rot. The foliage and woody parts 
of quince are rarely affected to any extent; consequently the 
leaf-spot and canker forms of this disease are not given con- 
sideration in this discussion. 
Black-rot of quince was first observed in Connecticut about 
1890, when it was prophesied that it might become a serious 
menace to quince-culture. While its range over the north- 
eastern United States is general, and its occurrence in and about 
Ohio and New Jersey is common, yet the disease ranks as one of 
minor importance on the quince. The disease is well known and 
destructive on the apple. 
