Discolored and Decayed Wood Associated with Injection Wounds in American Elm    (View PDF)

Alex L. Shigo and Richard Campana

Abstract: Dissection of 80 large American elm trees with a chainsaw revealed discolored and decayed wood associated with holes drilled for injections to control Dutch elm disease. Discolored wood was associated with every injection wound; injection wounds made in several successive years caused severe internal injuries. Until less injurious injection methods are developed, we suggest that injection holes be as small, shallow, clean-edged, and few as possible. Later injection sites should be at least 46 cm (18 in) above and not directly over older ones. If possible, drilling should be avoided at bud­ break and in the valleys of fluted roots.

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https://doi.org/10.48044/jauf.1977.060