Abstract
Wound manifestations and features of wound closure and reduction of swelling caused in black locust trees, Robinia pseudoacacia L., by attacks of the locust borer, Megacyllene robiniae Forster, were studied in Appalachian Maryland. Five external-symptom categories were identified: holes, “stellate” scars, “other” scars, swellings, and cankers. Numbers of holes and stellate scars were positively correlated with rates of occurrence of accumulated borer mines in the wood. An equation for estimating the number of borer attacks on trees was derived, using an evaluation of external symptoms on the bottom 3.3 m of tree boles. Time (years) between wound initiation and surface healing was positively correlated with tree age and negatively correlated with growth rate of the trees.
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