. Fig. 25.—Apple scab. After Craig. ing. The irritation and retardation of growth caused by the presence of the fungus induces the leaves to curl and wrinkle in a characteristic manner. The injuries by this disease may be enumerated as follows: lessened leaf value, retarded twig and wood growth, premature fall of fruit, retardation of full develop-

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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910