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INTRODUCTION by A J Grayson Director of Research and Development
SITE STUDIES SOUTH
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acid alder Alice Holt analysis aphid application Arboricultural assess B.Sc beech scale beneﬁts Britain British broadleaved cent Ceratocystis ulmi cloches clones conﬁrmed conidia conifers Corsican pine crop damage diameter Douglas ﬁr Dutch elm disease East England Conservancy effect epicormic established experiments fertiliser ﬁeld Field Surveys ﬁrst ﬁtted ﬁve ﬂowering Forest Ofﬁcer Forestry Commission fungus genetic germination glyphosate Head of Branch height growth herbicides host improved increase indicate infested inﬂuence investigated IUFRO larch Lodgepole pine London plane mixture mycelia mycorrhizal nitrogen North East England Northern Research Station nursery nutrient peat Ph.D planting plots pollen polythene populations production programme rates Report root sample Scotland Scotland Conservancy Scots pine seedlings signiﬁcant differences signiﬁcantly Silviculture Silviculture North Sitka spruce soil South species speciﬁc stem survival techniques temperature tests thinning timber treatment trees trials ulmi Wales weed control West Scotland Westonbirt Winter moth wood woodlands