Some stem tumors or knots on apple and quince trees . 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 experi
Some stem tumors or knots on apple and quince trees . 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 further. t Ciuco, Cal 2.—Stem tumors on a Mtoch (jiiim study. The progress of the disease on this tree has been noted forthree successive years. The tumors on this tree are exceptionally large at the beginning,and frequently appear in the form of a smooth swelling surroundingthe base of a dormant bud (fig. 3), quite often the terminal bud of [Cir. 3] SOME STEM TUMORS OR KNOTS ON APPLE AND QUINCE TEEES. a twig, and may be noted at the end of the growing season. Inthe form usually occurring on many other trees, the swellings appearon twigs and limbs indiscriminately, apparently having no connec-tion with the formation of buds. The tumors vary greatly in sizeon the same and on different trees; some are as small as a pea;others attain a size of 2 to 3 inches in diameter. This variationin size is noted even at the beginning of the formation. Imma-ture tumors are often formed on all por-tions of the tree, quite frequently occurringat the base of twigs (fig. 3) or springingfrom older limbs or from
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