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air pollution Alice Holt analysis aphid Arboriculture areas assessed B.Sc beech BRASIER Britain British broadleaved cent clones Commission Research Information conifer conservation Corsican pine crop cuttings damage deer density Douglas fir Dutch elm disease Edinburgh effects England Entomology established experiments fertiliser foliage Forest District forest health Forest Officer Forestry Commission Research genetic germination H. L. Davies Head of Branch height herbicides increase insect investigation larch lodgepole pine measurements micans mycorrhizas Northern Research Station Norway spruce nursery nutrient Ophiostoma pathogen Pathology peat permethrin Ph.D physiology pine beauty plantations plants plots population potential Research Information Note restocking sample Scientific Officer Scotland Scots pine seed seedlings shoot Silviculture North Sitka spruce sludge soil South species Statistics and Computing survey survival Tabbush temperature tested Thetford Forest timber transplants treatments trees treeshelters ulmi upland Wales weed control Wildlife windthrow wood woodland