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Alice Holt analysis aphid applied Arboriculture areas assessed B.Sc beech bark beneﬁts Britain British Timber broadleaved cent chemical Classiﬁcation clearfelling collected Commission Occasional Paper conﬁrmed conifers contorta Corsican pine crop culture damage deer deﬁciency defoliation Department Dutch elm disease Ecology effect established experiments fagisuga ﬁeld Field Surveys ﬁrst ﬁve ﬂowering foliar Forest Research Forestry and British Forestry Commission Forestry Commission Occasional glyphosate grey squirrels growth harvesting Head of Branch herbicide increase inﬂuence IUFRO larch Lodgepole pine M.I.For M.Sc MILLER Miss monoterpene Nectria nitrogen North Northern Research nursery nutrient nutrition Oﬁicer Oﬂicer pathogens Ph.D Pinus Pinus contorta planted polythene produced programme Research Station root samples Scientiﬁc scolytus Scotland Scots pine season Section seed origins seedlings Service shoot signiﬁcant Silviculture Sitka spruce soil species speciﬁc spoil survival tested thinning transplants treatment trees trials triclopyr upland variation Wales weed control windthrow wood