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ai/ha Alice Holt Lodge analysis aphid application Arboricultural areas assessed B.Sc beech Britain broadleaved cent compared concentrations conifers correlation crops cuttings damage density Dutch elm disease Ecology effect elm bark beetles Entomology estimates experiments fallow deer Field Surveys Foliar Forest Management Forest Research Forestry Commission Forestry Commission Report fungus galleries genetic germination glyphosate growth habitat Head of Branch height herbicides inﬂuence inner bark investigation larch Leaﬂet Lodgepole pine M.I.Biol M.I.For M.Sc methods multistriatus nitrogen North north west England Northern Research Station nursery nutrient pathogen Ph.D pheromone plantations planted plots population Princes Risborough Princes Risborough Laboratory produced programme Report on Forest Research Foresters response root sample sapwood scolytus Scotland Scots pine season Section seed seedlings shoots showed Silviculture Silviculture South Sitka spruce species squirrel staff survival technique timber treatment trees trial triclopyr upland weed control West Scotland woodland wych elm