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acid Alice Holt analysis aphid application Arboriculture areas assessment B.Sc beech Britain British broadleaved cent clones conifers coppice Corsican pine crop damage deer diameter Dutch elm disease Ecology effect England Conservancy Entomology established experiments fertiliser Field Surveys foliage Forest Officer Forest Research Forestry Commission fungus genetic germination glyphosate grafts Head of Branch herbicides improved increase infested investigated IUFRO Laboratory larch Lodgepole pine M.I.Biol M.I.For methods nitrogen North East England North Scotland Northern Research Station Norway spruce nursery nutrient pathogenicity Ph.D plantations planting plots population Princes Risborough production programme Report root sample Scientific Officer Scotland Scotland Conservancy Scots pine season seed origins seedlings shelters shoots Silviculture Silviculture North Sitka spruce soil South species squirrels stem survival techniques temperature tested thinning timber treatment trees trials ulmi upland Wales weed control West Scotland Westonbirt Westonbirt Arboretum windthrow wood woodland