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Shigo, Alex L. – Scientific American, 1985
Unlike animals, which heal, trees compartmentalize by setting boundaries that resist the spread of invading microorganisms. Discusses the creation of new walls by anatomical and chemical means in response to death of a branch or pruning. Points out that genetic control of compartmentalization has resulted from evolution of resistant species. (DH)
Descriptors: Botany, College Science, Disease Control, Evolution