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Elms occur, both naturally and cultivated, throughout much of the temperate world. Because of their high tolerance to extreme growing conditions and their widespread distribution, elms have been widely planted in cities, towns and rural areas throughout North America and northern Europe. As such, their current demise due to several pandemics of Dutch elm disease has spurred a huge body of research on breeding for disease resistance, conservation and systematics. The Elms: Breeding, Conservation and Disease Management provides the current state of knowledge in these areas and is an important reference work for pathologists, breeders, taxonomists, and arborists.
This book addresses the critical gaps among understandings of teacher leadership across organizational and cultural contexts. It challenges the use of the term teacher leadership as if there is a widely shared understanding of what it is and what it means for exercising influence and making decisions. The book describes how implicit meanings and competing assumptions about teacher leadership may contribute to uncertainty and confusion in school communities. The authors caution against the incorporation of teacher leadership in international policy making discussions without adequate consideration of contextual, organizational, historical, and cultural differences that may lead to school comm...
This 1984 symposium volume was the first of its kind to deal specifically with the vegetative fungal mycelium.
Revised papers from symposia held in 1982, 1983, and 1984.
Dutch elm disease is a significant problem in forestry and horticulture which has proven remarkably difficult to ameliorate. Since the introduction of the Dutch elm disease pathogen to North America, the disease has devastated the elm population of this continent and has been the subject of intensive research. This book summarizes the range of approaches that have been taken to address the disease, and emphasizes the significant progress over the past decade in applying methods from cell and molecular biology. Dutch Elm Disease: Cellular and Molecular Approaches will be of interest to scientists in plant pathology, horticulture, forestry, biological control, and plant breeding.
This bulletin reports on a British experience in which water storage employing overhead water sprinklers was used to prevent deterioration of high quality pine logs, following the gale of October 1987 when 4 million m3 of timber in the South of England, about one third pine, was blown down. The logs were stored satisfactorily for up to four years before release onto the market, and all aspects of the storage operation itself were subject to detailed scientific investigation.