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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 4 of 4 (0.063 seconds)Spelling suggestions: "subject:"cilium canadensis"" "subject:"cilium canadiens""
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Mining Herbaria For Clues To the Historic Prevalence of Lily Leaf Spot Disease (Pseudocercosporella inconspicua) On Gray's Lily (Lilium grayi) and Canada Lily (L. canadense)Ingram, Russell J., Levy, Foster, Barrett, Cindy L., Donaldson, James T. 01 April 2017 (has links)
Lily leaf spot disease, caused by the fungal phytopathogen, Pseudocercosporella inconspicua, infects Lilium canadense and L. grayi. The disease is currently ubiquitous in populations throughout the range of L. grayi. To determine the historical prevalence of the disease, lily specimens from eight herbaria were examined visually and microscopically, and a search for records of the pathogen was conducted using mycology databases and relevant literature. Of 516 herbarium specimens, two L. canadense and one L. grayi had the characteristic leaf lesions that contained diagnostic conidia of P. inconspicua. All three diseased specimens were collected prior to 1950. Mycological collections included two North American records of P. inconspicua on L. canadense, two on L. michiganense, one on L. philadelphicum var. andinum, and one on a cultivated Eurasian lily hybrid. Interestingly, the earliest diseased herbarium specimens were from the northeastern US with a later appearance in the southern Appalachians, a pattern also present in mycological collections of P. inconspicua. The rarity of historical specimens with disease, the temporal geographic pattern of occurrence, and the ubiquity of P. inconspicua in current populations of L. grayi suggest the spread of lily leaf spot disease in North America may threaten the viability of native Lilium host species.
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Potentiel d'infestation des populations sauvages de lis indigènes (Lilium canadense et L. philadelphicum) par le criocère du lis (Lilioceris lilii)Bouchard, Anne-Marie January 2008 (has links)
Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal.
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Potentiel d'infestation des populations sauvages de lis indigènes (Lilium canadense et L. philadelphicum) par le criocère du lis (Lilioceris lilii)Bouchard, Anne-Marie January 2008 (has links)
Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal
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Range-wide Prevalence and Impacts of Pseudocercosporella inconspicua on Lilium grayi and an Assessment of L. superbum and L. michauxii as ReservoirsBarrett, Cindy L. 01 May 2017 (has links)
Lilium grayi (Gray’s Lily), a southern Appalachian endemic species, is threatened by a Lilium-specific fungal pathogen, Pseudocercosporella inconspicua. The disease is characterized by tan lesions that can cause early senescence, while also lowering seed production and viability. This project tested for P. inconspicua conidia and accessed health at nine locations. The disease was present and ubiquitous across the range of L. grayi. Through identification of P. inconspicua conidia in the field, L. superbum (Turk’s Cap Lily) was identified as an additional host, while L. michauxii (Michaux’s Lily) was disease-free. However, infection was inducible in both species. With the disease widespread in L. superbum and this species represented by many large populations, L. superbum may act as disease reservoir, further complicating the outlook for L. grayi. The disease should be considered an epidemic because of its impact on individual plants, its commonness within populations, and its ubiquity across the geographical range.
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