91 
Kerr stated that during a large nursery experience he had observed 
trees bearing leaves destitute of these large glands to be specially sub¬ 
ject to mildew. Other nurserymen have observed the same fact, even 
as long ago as the days of Downing. This, in connection with the fact 
that mildew is rare in the eastern United States and that most of our 
orchard varieties possess glandular leaves, led me to make careful ob¬ 
servations during the remainder of the year. The tree above referred 
to as attacked in early spring bore leaves destitute of glands.* So 
also the twelve at Hubbardston, Mich. In fact, frequent observations 
in the orchards of several States brought to light everywhere the same 
curious correlation. Trees with gland-hearing leaves were free from mil¬ 
dew , and milde wed trees hore leaves destitute of glands. 
One exception only in perhaps 150 cases was noted; a tree with slight 
mildew and traces of glands. The same correlation has also been ob¬ 
served, according to Mr. Wickson, in California. It would seem, there¬ 
fore, as though peach trees of the type bearing glandular leaves are 
more resistent to this mildew than other varieties, but whether this 
will hold good for all localities and all varieties remains to be seen. 
BLACK SPOT OF PEACHES.t 
This disease was unusually prevalent on the Delaware and Chesa¬ 
peake peninsula. Indeed, I have never before known it to be one-fourth 
as abundant. All kinds were attacked, even the early and midseason 
varieties which usually escape. Many fruits were very badly spotted 
and unsalable. Very often also the spots coalesced into broad patches 
coyering one-third to one-lialf of the peach. The side attacked was 
dwarfed. The flesh under the black patches was unusually solid and 
ripened very slowly, remaining greenish and bitter when the other side 
was fully ripe. 
The observations of this year confirm earlier ones and lead me to think 
that dry weather is not favorable to the development of this fungus. 
During the growth and ripening of the fruit, rains occurred at frequent 
intervals and there was no dry spell such as usually occurs. January, 
February, March, and the first week in April were also rainy, and the 
winter was mild; no zero weather. 
FROSTY MILDEW, f 
This parasite evidently flourishes best in shady places. It was un¬ 
usually common on the Chesapeake and Delaware peninsula in the fall 
of 1891, especially on trees bearing dense and late-ripening foliage. In 
previous seasons I have also noticed it most abundant on the foliage 
of highly fertilized trees, especially those given nitrogen or complete 
fertilizers and growing late into autumn. For example, in the same 
* These glands secrete a fluid sought after by bees and other insects, 
t CladospoHum carpophilum, Thm. 
I Cercosporella persica, Sacc, 
