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The leafy sucker growths on elm trunks and branches, also called "hairs" or "feathers," are somewhat necessary to these water-loving trees, especially aloft, to keep them from dehydrating. They should be pruned sparingly. But all elms should be watched closely for deadwood, which invites the bark beetles that carry dread Dutch elm disease. Plane trees are vulnerable to cankerstain, a fungoid disease that is highly infectious, but less so in dead of winter. That is the only time planes should be pruned; and even then, disinfect the tools. Pin oaks put out laterals so closely spaced sometimes as to look overgrown, but these should be thinned with much caution. This tree's branches support each other under loads of rain and snow. |
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