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Articles by A. Dan Wilson
Total Records ( 2 ) for A. Dan Wilson
  A. Dan Wilson
  The incidence of clavicipitaceous anamorphic endophytes, non-choke inducing endosymbiotic fungi of the genus Neotyphodium that systemically infect grasses, in eighteen Hordeum species from the U.S. National Plant Germplasm System was examined using light and Scanning Electron Microscopy (SEM). Seventeen plant inventory accessions from only three Hordeum species, including H. bogdanii, H. brevisubulatum subsp. violaceum and H. comosum, were found to contain significant levels of seed and seedling infection ranging from 18-99%. Neotyphodium-endophytes were found in Hordeum germplasm from one country (Argentina) in South America and four countries (Afghanistan, China, Iran and Kazakhstan) in Asia. The viability of endophytic mycelium in seeds was confirmed by culturing these fungi on potato dextrose agar medium from aleurone tissue of seeds and by direct observations of hyphae in leaf sheaths of 3-4 week-old seedlings. Morphological characteristics of these fungi were further characterized using SEM to determine similarities and differences in conidiophores and conidia produced in culture. The importance, significance and potential benefits of Neotyphodium-endophytes from wild Hordeum as sources of insect resistance in cultivated barley, other cereal grasses and in wild grasses included in the Conservation Reserve Program are discussed. Suggested strategies for the proper maintenance of this valuable germplasm also are elucidated.
  A. Dan Wilson
  Oak wilt, caused by Ceratocystis fagacearum (T.W. Bretz) J. Hunt, is probably the most destructive disease of oak trees (Quercus species) in the United States, and is currently causing high mortality at epiphytotic proportions in central Texas. The serious potential for damage prompted an increase in federal funding within the past fifteen years for new oak wilt research. New research developments have included adaptive utilizations of industrial technologies such as Electronic Aroma Detection (EAD) and aerial infrared remote sensing surveys for early disease detection and diagnosis, geotextile polymeric landscape fabrics etc. All of these areas of increased knowledge have contributed to and provided means for improving oak wilt suppression in a more effective and integrated way. The development of these improved methods for oak wilt control are reviewed here and discussed in relation to current state forestry pest-control programs that have begun to implement these new methods in their oak wilt suppression operations.
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