PEAR DISEASES 347 
the fungus commonly stimulates the cedar to witches’-broom 
formation. Here in these tissues of the cedar the mycelium is 
perennial, the tissues retaining the fungus year after year with- 
out being infected anew by eciospores from a pomaceous host. 
Control. 
It is suggested that pear-scab sprayings (see page 335) 
probably would reduce this disease. Incense cedars should 
be removed where they are not highly valued, and _pear- 
growers should avoid planting them. As a.rule, however, 
this practice is unpopular, inasmuch as these trees are a 
valuable forest crop. 
REFERENCES 
Jackson, H. S. A Pacific Coast rust attacking pear, quince, etc. 
Oregon Crop Pest and Hort. Bienn. rept. 1913-1914 : 204-212. 
1915. 
Jackson, H. S. A new pomaceous rust of economic importance, 
Gymnosporangium Blasdaleanum. Phytopath. 4: 261-269. 1914. 
O’Gara, P. J. A rust — new on apples, pears, and other pome fruits. 
Science, 39: 620-621. 1914. 
LeEaFr-BLIGHT 
Caused by Fabrea maculata (Lév.) Atk. 
This disease, which has been called scald and leaf-blight, is 
known in nearly all countries where the pear is grown. It is 
recorded from Germany, Sweden, Italy and France, and is 
especially common in eastern United States. In New York it 
is most abundant in the Hudson Valley and in the western part 
of the state, but perhaps even in these regions is less important 
than farther south and west. It is agreed that pear seedlings 
are most seriously affected ; in some nurseries their cultivation 
has been greatly hindered, and in certain cases their growing 
has been abandoned. In Europe the leaf-blight has been 
known for at least a century, while in the United States it has 
