. Fungous diseases of plants, with chapters on physiology, culture methods and technique . ng a dry period on ac-count of the fact that when the watersupply is abundant, it may not benoticeable during the growing fungus producing this disease hasbeen isolated from both the diseasedwood and pith, and upon infection iscapable of reproducing the disease. Sev-eral fruiting stages have been found, atleast one of which is unquestionably astage in the life cycle of this fungus. Ithas been difficult to identify all of thespore forms with certainty, but the pyc-nidial stage would be consider
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . ng a dry period on ac-count of the fact that when the watersupply is abundant, it may not benoticeable during the growing fungus producing this disease hasbeen isolated from both the diseasedwood and pith, and upon infection iscapable of reproducing the disease. Sev-eral fruiting stages have been found, atleast one of which is unquestionably astage in the life cycle of this fungus. Ithas been difficult to identify all of thespore forms with certainty, but the pyc-nidial stage would be considered a speciesof Dothiorella (Fig. 182). Successfulinfection experiments with myceliumobtained from germinating pycnosporeshave been made. The relationship ofthis fungus to an ascogenous stagesometimes associated with it, or follow-ing it, upon the dead canes has beenunder careful study, but has not yetbeen reported. The fungus grows read-ily upon any of the solid nutrient media,?c., o T^ producing a considerable gray-green Fig. 182. Dothiorella on -^^ ° o .7 o Currant Canes FUNGI IMPERFECTI 365 LIII. LEAF BLIGHT OF PEAR AND QUINCEEntomosporium maculatum Lev. DuGGAR, B. M. Some Important Pear Diseases. IL Leaf Blight. Cornell Agl. Exp. Sta. Built. 145: 611-615. , 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. Agl. (1888): 357-364. Habitat relations. The leaf blight of the pear and quince hasbeen observed in this country as v^ell as in Europe for many years ;it has also received considerable attention atvarious agricultural experiment stations in pear-producing regions. In New York it is mostabundant apparently in the Hudson Valley, andin general it would seem to be more injuriousin states in the Appalachian region. Nearlyall varieties of pear are affected, but Duchessand Kieff
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