. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 365 LIII. LEAF BLIGHT OF PEAR AND QUINCE Leaf Blight. Cornell Entomosporium maculatum Lev. Duggar, B. M. Some Important Pear Diseases. II. Agl. Exp. Sta. Built. 145: 611-615. 1898. Fairchild, D. G. Experiments in Preventing Leaf Diseases of Nursery Stock in Western New York. N. Y. Agl. Exp. Sta. Rept. 11 : 642-652. 1892. (Also, Journ. Myc. 8: 338-351.) Scribner, F. L. Leaf-Blight and Cracking of the Pear. U S Dept Ad (1888): 357-364. Habitat relations. The leaf bli
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. FUNGI IMPERFECTI 365 LIII. LEAF BLIGHT OF PEAR AND QUINCE Leaf Blight. Cornell Entomosporium maculatum Lev. Duggar, B. M. Some Important Pear Diseases. II. Agl. Exp. Sta. Built. 145: 611-615. 1898. Fairchild, D. G. Experiments in Preventing Leaf Diseases of Nursery Stock in Western New York. N. Y. Agl. Exp. Sta. Rept. 11 : 642-652. 1892. (Also, Journ. Myc. 8: 338-351.) Scribner, F. L. Leaf-Blight and Cracking of the Pear. U S Dept Ad (1888): 357-364. Habitat relations. The leaf blight of the pear and quince has been observed in this country as well as in Europe for many years ; it has also received considerable attention at various agricultural experiment stations in pear- producing regions. In New York it is most abundant apparently in the Hudson Valley, and in general it would seem to be more injurious in states in the Appalachian region. Nearly all varieties of pear are affected, but Duchess and Kieffer are perhaps the most resistant of those ordinarily grown. Moreover, in different regions of the Atlantic states there seems to be a difference in the susceptibility of varieties. Considerable damage may also be done in the nurseries to seedling pears, although grafted stock is far more subject to the leaf spot than to the leaf blight. Root suckers on seedling pears throughout the country are very generally injured. The spots are sometimes noticed on the tips of young branches, and it has been very definitely shown that in such situations the fungus may readily pass the winter. The effect of the disease upon seedlings is to harden the wood early and prevent the best results from budding. Symptoms. The spots produced by this fungus are particularly evident on the upper surfaces of the leaves, occurring first as small discolored areas which become dull red at the center, with dark borders. They are more or less circular in outline, but they may be closely
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