Some stem tumors or knots on apple and quince trees . near Chico, Cal. less degTee with the woolly-knot form of the hairy-root disease. Theremaining trees were apparently healthy, having smooth scions which had tumors before planting developed in nearlyevery instance roots from the tumors, which then agreed in structureand appearance with the woolly-knot form of hairy-root. STRTJCTURE OF TUMORS. If a section is made longitudinally through one of the tumorstaken from the limb of an apple tree after roots have been forcedfrom it hy moisture (fig. 7) and through one of the underground
Some stem tumors or knots on apple and quince trees . near Chico, Cal. less degTee with the woolly-knot form of the hairy-root disease. Theremaining trees were apparently healthy, having smooth scions which had tumors before planting developed in nearlyevery instance roots from the tumors, which then agreed in structureand appearance with the woolly-knot form of hairy-root. STRTJCTURE OF TUMORS. If a section is made longitudinally through one of the tumorstaken from the limb of an apple tree after roots have been forcedfrom it hy moisture (fig. 7) and through one of the undergroundrooted tumors of the woolly-knot form of hairy-root (fig. 8), anidentical structure is revealed. The wood elements of both are muchdistorted and disarranged, growing somewhat in a fan shape fromthe origin of the tumors near the center of the stem or root. The [Cir. 3] SOME STEM TUMOES OK KNOTS ON APPLE AND QUINCE TREES. 11 bundles of woody tissue are mingled abnormally with small patchesof parenchymatous tissue. Springing from the surface of each of.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherwashingtondcusdept
