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Page 6 · column 3 of 9 · from the scan, no model involved
The symptoms of Dutch elm disease are most apparent during June and July. First noticeable are the wilting, curling and yellowing of leaves on one or more of the tree’s upper branches. Later, the tree prematurely sheds its leaves and the sapwood vessels plug with a fungus. Death usually occurs within a few weeks or in a year or more. The Dutch elm disease is caused by a fungus that gets into the sap conducting vessels of the tree where it multiplies rapidly to literally shut off the tree’s water. The fungus is carried from tree to tree, healthy or otherwise, by two species of elm bark beetles, the European elm bark beetle and the native elm bark beetle.
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