Some stem tumors or knots on apple and quince trees . this formoccurs on shoots itsprings more fre-quently from thevicinity of a bud(fig. 11), of ten justbeneath it. Thesefine roots areformed in groups,or bunches, agreat many oftenspringing from asingle origin of each of these clumps of roots is similar to that of therudimentary roots in the aerial tumors. It follows, then, that thehair^-root disease may have at least three forms, which are more orless distinct: The simple, the woolly-knot, and the aerial forms. EFFECT OF THE DISEASE UPON TREES. Owing to the complexity in th
Some stem tumors or knots on apple and quince trees . this formoccurs on shoots itsprings more fre-quently from thevicinity of a bud(fig. 11), of ten justbeneath it. Thesefine roots areformed in groups,or bunches, agreat many oftenspringing from asingle origin of each of these clumps of roots is similar to that of therudimentary roots in the aerial tumors. It follows, then, that thehair^-root disease may have at least three forms, which are more orless distinct: The simple, the woolly-knot, and the aerial forms. EFFECT OF THE DISEASE UPON TREES. Owing to the complexity in the forms of the hairy-root diseaseand the difficulty of obtaining accurate information as to their finaleffect upon orchard trees, and in view of the fact that extensive ex-j)eriments are being conducted to determine the nature of each formand its effect upon the life and fruitfulness of apple trees, it will notbe safe at present to make a definite statement as to the effect of thesetumors further than to give the observations of the writer. [Cir. 3]. Fig. -The woolly-knot form of hairy-root on a Northern Spyapple tree grown in an experiment. SOME STEM TUMORS OR KNOTS ON APPLE AND QUINCE TREES. 13
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