Some stem tumors or knots on apple and quince trees . lication summarizes a part of an extensive inves-tigation which Doctor Hedgcock is pursuing on the crown-gall and related dis-eases. The paper brings out some important facts regarding the relation ofthe knots above ground to certain forms of hairy-root, and contains advice tonurserj^men as to how to avoid the trouble. These investigations were begunat the Mississippi Valley Laboratory, St. Louis, Mo., under the direction of Doc-tor Hermann von Schrenk, and will be continued under the direction of Mr. M. , Pathologist in Charge of In
Some stem tumors or knots on apple and quince trees . lication summarizes a part of an extensive inves-tigation which Doctor Hedgcock is pursuing on the crown-gall and related dis-eases. The paper brings out some important facts regarding the relation ofthe knots above ground to certain forms of hairy-root, and contains advice tonurserj^men as to how to avoid the trouble. These investigations were begunat the Mississippi Valley Laboratory, St. Louis, Mo., under the direction of Doc-tor Hermann von Schrenk, and will be continued under the direction of Mr. M. , Pathologist in Charge of Investigations of Diseases of Fruits.—B. , Pathologist and Physiologist, and Chief of Bureau. ^ Garman, H. Diseases of Nursery Stock—A Knot Disease of Apple Agricultural Experiment Station, Bulletin 93, pp. 106-107 ;ind fig. 4,1901. [Cu-. 3] 5 SOME STEM TUMORS OR KNOTS ON APPLE AND QUINCE TREES. of knots occurring on apple trees which is apparently the samedisease; this he reports from at least two localities in the Fig. 1.—Stem tumors liple tree at Mesilla Park, N. Mex. AVaite, of the Bureau of Plant Industry, reports the disease as com-mon on the apple in tidewater Maryland and Virginia. DESCRIPTION. On the apple tree this disease appears most often on the trunk andlarger limbs (fig. 1), but in a number of instances it has been found [Cir. 3] SOME STEM TUMOES OK KNOTS ON APPLE AND QUINCE TREEt affectino; the twigs and smaller limbs (fig. 3). A good example of the disease as found on all parts of the tree occurs on a Charlamoffapple tree in the experimental orchard of the Arkansas AgriculturalExperiment Station, Faj^etteville, Ark. This was first reported tothe Bureau of Plant Industry by Vincenheller, of that station, whokindly donated the tree to the Department of Agriculture for furthersomestemtumorsor03hedg
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