Interfere with the downward food current through the bark
If you should injure the roots, the water supply to the leaves would be cut off and the leaves would immediately wither. On the other hand, if you remove the bark, that is, girdle the tree, you in no way interfere with the water supply and the leaves do not wither. Girdling does, however, interfere with the downward food current through the bark.
Fig. 29. A Thickening
Above the Wire that
Caused the Girdling
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