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Alice Holt analysis aphid Arboricultural areas assessed B.Sc beech Britain British broadleaved clonal clones Commission Research Office conifers Conservancy Corsican pine damage defoliation density dieback Douglas fir duct Dutch elm disease ecology effects England establishment experiments Farnham FC Research Division FC Research Information field vole Figure Forest Officer Forest Research Forestry Commission Forestry Commission Research fungi fungus GARDINER genetic Head of Branch height herbicides imazapyr increase insects investigated Kielder Kielder Forest landfill cap larch lodgepole pine lowland M.Sc measured ment micans Northern Research Station nursery peat Ph.D plots poplar population prechill Proceedings production QUINE Report Research Information Note root sample Scotland Scots pine Section seed Silviculture North Sitka spruce South species Statistics and Computing storage survey testing timber tion treatments tree growth Tree Improvement University of York vegetative propagation vole abundance Wales weed control windthrow wood woodland yield