Some stem tumors or knots on apple and quince trees . Fig. 7.—Longitudinal section ofa tumor on an apple limb afterthrowing out roots when placedin soil. Fig. 8.—Longitudinal section of woolly-knot on aroot-grafted apple tree grown from apparently-healthy scion and root. these forms are numerous fleshy roots which are often fasciated anddistorted. These fleshy roots as they grow older either rot away inpart or become woody. RELATION OF THE TUMORS TO OTHER FORMS OF DISEASE. With our present knowledge, therefore, and as a result of the ob-servations and experiments previously mentioned, these tu
Some stem tumors or knots on apple and quince trees . Fig. 7.—Longitudinal section ofa tumor on an apple limb afterthrowing out roots when placedin soil. Fig. 8.—Longitudinal section of woolly-knot on aroot-grafted apple tree grown from apparently-healthy scion and root. these forms are numerous fleshy roots which are often fasciated anddistorted. These fleshy roots as they grow older either rot away inpart or become woody. RELATION OF THE TUMORS TO OTHER FORMS OF DISEASE. With our present knowledge, therefore, and as a result of the ob-servations and experiments previously mentioned, these tumors onthe limbs and trunks of apple trees may be considered the same diseaseas the woolly-knot form (fig. 9) of hairy-root; in other Avords, theyare the aerial form of hairy-root. The simple form of hairy-root,which was described first by Stewart, Rolfs, and Hall ^ and men-tioned later by the writer ^ as a form of disease distinctly different « Stewart, F. C, Rolfs, F. M., and Hall, F. H. Geneva, N. Y., AgriculturalExperiment Station Bulletin
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