. Fig. 63. Potato Diseases. a. Powdery dry rot, b. Rhizoctonia lesion on young potato sprouts (after W. A. Orton), c. Rhizoctonia sclerotia on seed potato tubers, d. melters, artificially in- duced by inoculating with a pure culture of Sderoltum Rolfsii. e. pure culture of 5. Rolfsii.

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