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action actual aphide appears attack bark beech beetles bitumen bolt bracing branch broad-leaved trees Burnham Beeches butt callus cambium caterpillars cavity Chermes colour concrete conifers considerable cracks creosote crown damage dangerous decoration definite diameter difficult disease dressing edge effect especially example fact fall feet filling foliage frequently fructification fungal fungus gardens goat moth ground growing growth heavy hedges height holes inches insect large trees larvae layer lead arsenate leaf leaves less lopping lower manure material means method moth necessary occasionally old trees ornamental ornamental trees Orygia owner pest pine poison poplar possible practice prevent pruning removed result road rollers root system rule satisfactory sawfly Scots pine shoots side soil spray stem strain strand wire street trees stumps surface timber transplanting trees planted trunk Unbalanced Line waterproof whilst wind wire rope wood wound young trees