PEAR DISEASES 353 
Rep LrEar 
Cause not definitely known 
This peculiar and interesting disease has been observed in 
New York State during the past five or six years. There are 
no extensive data as to its preference for varieties, although it 
has been observed especially on the Kieffer and Clairgeau. 
In some cases under attention the orchards showing red-leaf, 
or crimson foliage, were located on a hillside, and the disease 
was confined to those individuals occupying the lower part of 
the orchard. Such trees also exhibit signs of general unthrifti- 
ness. Affected trees stand out prominently among their 
healthy neighbors. and exhibit an entire foliage discoloration ; 
a dark or purplish red color. The suggestion has been made 
that lack of vigor, of which red-leaf is a sign, may be due to one 
or more factors. Such factors worthy of note are poor under- 
drainage, insufficient plant food, a diseased condition of the 
trunk or roots, and winter and drought injuries. 
REFERENCE 
Stewart, F.C. Notes on New York plant diseases,I. Pear. Crimson 
foliage. New York (Geneva) Agr. Exp. Sta. Bul. 328 : 371-372. 
1910. 
2A 
