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acid Alice Holt Lodge analysis aphid application Arboriculture areas assessment B.Sc B.Sc(For bark beetles beech Britain broadleaved trees cent chemical clearfelling conifers Corsican pine crop culture damage deer Dutch elm disease Ecology Edinburgh effect England Entomology established experiments fagisuga fertiliser Field Surveys foliar Forest Officer Forest Research Forestry Commission fungus Genetics germination glyphosate growth harvesting Head of Branch height herbicide improved increase investigated IUFRO Laboratory levels Lodgepole pine M.I.Biol M.I.For M.Sc methods monoterpene mycorrhizas nitrogen North East England Northern Research Station nursery nutrient pathogen Pathology Ph.D Pinus plantations planting plots population Princes Risborough produced programme response root sample Scientific Officer scolytus Scotland Scotland Conservancy Scots pine season Section seed origins seedlings shoots showed Silviculture Silviculture North Sitka spruce soil South species squirrels staff stem survival techniques temperature tested timber treatment trials triclopyr ulmi upland Wales weed control Westonbirt windthrow wood woodland