
New York AGRICULTURAL EXPERIMENT STATION. 205 
or leaf curl (Hxoascus) or of scab (Cladosporium carpophilum) 
were taken. There is a disease of Japan plums which resembles 
peach yellows, but we have had little opportunity to study it. 
QUINCE DISEASES. 
Lear Bucur ann Fruit Spot (Lntomosporium maculatum 
Lév).—Correspondents report considerable damage done by this 
disease ; still we believe that it has been much less destructive 
than usual. While .the fungus attacks the fruit as well as the 
leaves it is on the latter that it does the most damage. 
We have frequently observed that on quince leaves the Hnto- 
mosporium spots are of two sorts: (1) The typical sort, which 
is brown, 3 millimeters or more in diameter and bears at the 
center a black pimple, the acervulus, commonly visible only on 
the upper surface of the leaf. Two or-more such spots may 
coalesce to form a still larger spot with two to several acervuli. 
(2) Small black spots, each bearing a single black acervulus 
which occupies nearly the whole of the spot and: is usually visi- 
ble on both sides of the leaf. Curiously enough the acervuli on 
the small spots are somewhat larger than those on the large spots, 
but otherwise they do not differ. 
CANKER AND BuAcKk Ror (Spheropsis malorum Pk.)—Some of 
the quince orchards are seriously affected with canker of the 
trunk and larger branches. In April we found Sphewropsis 
malorum Pk. fruiting abundantly on cankered limbs. There 
seems to have been very little black rot of the fruit. 
Powpery Minpew (Podosphera oxyacanthe (DC.) D Byy.—In 
August we observed powdery mildew on quinces at Geneva and 
Penn Yan. At the latter place it was abundant on nearly every 
tree in a large orchard of young thrifty trees, but apparently it 
was doing them no damage. We also observed traces of this fun- 
gus on quinces at Geneva in 1899. | 
It occurred only on the upper surface of the leaves and showed 
a decided preference for the older leaves, rarely attacking the 
young leaves of the new growth. In both these respects it is in 
direct contrast with the powdery mildew on cherry, which is 
