DISEASES OF THE QUINCE. 93 
6. Lear Buiegut.—This is very unlike the leaf blight 
of the apple and pear. The specimens examined have 
not yet revealed to us the cause. It first appears on the 
edges of the leaves ; sometimes on one side only, but more 
generally reaching nearly all the way around the leaf. At 
first it is of a reddish brown; but as it extends inward 
toward the mid vein, it gradually assumes: a deeper hue, 
till at last it is almost jet black, and covers very nearly 
all the blade of the leaf. As the disease progresses the 
Fig. 66.—LEAF BLIGHT. 
edges of the tenderer leaves curl upward, and eventually 
the whole dies and falls. 
7. Quince Rot (Spheropsis Cydonia, C. and E.).— 
This disease usually begins at a few points on the surface 
of the fruit, and spreads regularly in enlarging circles 
until the whole fruit is decayed. As these spots enlarge, 
the centers grow dark, and soon may be seen asa mass of 
black points, which contain a multitude of brown spores, 
each capable of spreading the disease. A sound quince 
