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areas aroused become established become infected branches breed carry cent central colonize commercial death derogation Despite diameter disease resistance diseased trees Dutch elm disease early eastern elm bark beetles Europe European countries European oaks eventually evidence excluded fagacearum feeding activities Firstly Forestry Commission further south groups healthy trees History and biology important infection centre introduce the fungus involve isolated killed legislation link logs means Minnesota Missouri moisture nitidulids North American northern number oak bark beetle oak forest oak Quercus OAK WILT J N oakwood occur outlined overground spread pathogen Pennsylvania Plant Health PLATE possible present Principal quence rarely recorded red oak regulations removal reports resemble ring risk root grafts Scolytus intricatus Secondly small southern species speculating spores sporulating mat stance suitable susceptibility symptoms tion trade transmission tree becomes trunk UNIVERSITY OF MICHIGAN vector white oak WILT J N Gibbs Wisconsin Wood and Bark wounds xylem