{"id":{"repo_id":"ohiolink","oai_identifier":"oai:etd.ohiolink.edu:osu1364222371"},"canonical_url":"https://search.dev.ndltd.org/etd/ohiolink/oai:etd.ohiolink.edu:osu1364222371","repository":{"repo_id":"ohiolink","name":"OhioLINK","base_url":"https://etd.ohiolink.edu/acprod/odb_etd/ws/oai/oai"},"display":{"title":"Aureobasidium Microstictum (Bubak) Cooke, The Casual Agent of Leaf Streak of Daylily (Hemerocallis L.), and Its Involvement in Spring Sickness of Daylily","abstract":"Although daylilies are generally considered to be 'care-free,' several diseases including Leaf Streak and Spring Sickness can be problems. The causal agent of Leaf Streak is Aureobasidium microstictum, which is consideredto be synonymous with Collecephalus hemerocalli J.A. Spencer. Although the exact cause of Spring Sickness is unknown, there is an indication that the same fungus, A. microstictum, is involved in rot of tissue observed in plants with Spring Sickness. Objectives of this research were comparisons of isolates of A. microstictum and an isolate of C. hemerocalli, investigation on pathogenicity of A. microstictum, and the control of Leaf Streak.Regarding to the size of conidia, and shape of fungal structures including, hyphae, conidiophores, and conidia of eight isolates of A. microstictum and one isolate of C. hemerocalli were compared. C. hemerocalligenerally had the same morphological features as A. microstictum. In addition, the great variability in the size of conidia within each isolate was observed.The importance of wounding for penetration by the fungus or development of Leaf Streak was confirmed. Great diversity was found in both virulence among isolates of A. microstictum and susceptibility of cultivars.Direct injection of fungal spores resulted in rot of tissue, resembling the ones found in plants with Spring Sickness.Chemical control of Leaf Streak with fungicides were tested. Application of one fungicidal product, Benefit (thiophanate-methyl and iprodione), significantly decreased the disease severity, compared to the control. Despitethe extensive labor and the cost of chemical, fungicide application is the most plausible method to control Leaf Streak at this moment, due to lack of details of the disease cycle and mode of penetration.","abstract_html":"Although daylilies are generally considered to be 'care-free,' several diseases including Leaf Streak and Spring Sickness can be problems. The causal agent of Leaf Streak is Aureobasidium microstictum, which is consideredto be synonymous with Collecephalus hemerocalli J.A. Spencer. Although the exact cause of Spring Sickness is unknown, there is an indication that the same fungus, A. microstictum, is involved in rot of tissue observed in plants with Spring Sickness. Objectives of this research were comparisons of isolates of A. microstictum and an isolate of C. hemerocalli, investigation on pathogenicity of A. microstictum, and the control of Leaf Streak.Regarding to the size of conidia, and shape of fungal structures including, hyphae, conidiophores, and conidia of eight isolates of A. microstictum and one isolate of C. hemerocalli were compared. C. hemerocalligenerally had the same morphological features as A. microstictum. In addition, the great variability in the size of conidia within each isolate was observed.The importance of wounding for penetration by the fungus or development of Leaf Streak was confirmed. Great diversity was found in both virulence among isolates of A. microstictum and susceptibility of cultivars.Direct injection of fungal spores resulted in rot of tissue, resembling the ones found in plants with Spring Sickness.Chemical control of Leaf Streak with fungicides were tested. Application of one fungicidal product, Benefit (thiophanate-methyl and iprodione), significantly decreased the disease severity, compared to the control. Despitethe extensive labor and the cost of chemical, fungicide application is the most plausible method to control Leaf Streak at this moment, due to lack of details of the disease cycle and mode of penetration.","abstract_has_math":false,"creators":["Kobayashi, Hideka"],"institution":"The Ohio State University","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Plant Pathology","degree_department":null,"school":null,"contributors":["M. Riedel, Richard"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1998,"date_issued":"1998","date_published":"1998","updated_at":"2026-07-24T03:37:01Z","subjects":["Plant Pathology"],"languages":["English"],"rights":["unrestricted","This thesis or dissertation is protected by copyright: all rights reserved. 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Objectives of this research were comparisons of isolates of A. microstictum and an isolate of C. hemerocalli, investigation on pathogenicity of A. microstictum, and the control of Leaf Streak.Regarding to the size of conidia, and shape of fungal structures including, hyphae, conidiophores, and conidia of eight isolates of A. microstictum and one isolate of C. hemerocalli were compared. C. hemerocalligenerally had the same morphological features as A. microstictum. In addition, the great variability in the size of conidia within each isolate was observed.The importance of wounding for penetration by the fungus or development of Leaf Streak was confirmed. Great diversity was found in both virulence among isolates of A. microstictum and susceptibility of cultivars.Direct injection of fungal spores resulted in rot of tissue, resembling the ones found in plants with Spring Sickness.Chemical control of Leaf Streak with fungicides were tested. Application of one fungicidal product, Benefit (thiophanate-methyl and iprodione), significantly decreased the disease severity, compared to the control. Despitethe extensive labor and the cost of chemical, fungicide application is the most plausible method to control Leaf Streak at this moment, due to lack of details of the disease cycle and mode of penetration."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf","p.88","3.39 MB"]},{"key":"dc:title","label":"Title","values":["Aureobasidium Microstictum (Bubak) Cooke, The Casual Agent of Leaf Streak of Daylily (Hemerocallis L.), and Its Involvement in Spring Sickness of Daylily"]}]}],"canonical_facts":{"dc:contributor":["M. Riedel, Richard"],"dc:creator":["Kobayashi, Hideka"],"dc:date":["1998"],"dc:description":["Although daylilies are generally considered to be 'care-free,' several diseases including Leaf Streak and Spring Sickness can be problems. The causal agent of Leaf Streak is Aureobasidium microstictum, which is consideredto be synonymous with Collecephalus hemerocalli J.A. Spencer. Although the exact cause of Spring Sickness is unknown, there is an indication that the same fungus, A. microstictum, is involved in rot of tissue observed in plants with Spring Sickness. Objectives of this research were comparisons of isolates of A. microstictum and an isolate of C. hemerocalli, investigation on pathogenicity of A. microstictum, and the control of Leaf Streak.Regarding to the size of conidia, and shape of fungal structures including, hyphae, conidiophores, and conidia of eight isolates of A. microstictum and one isolate of C. hemerocalli were compared. C. hemerocalligenerally had the same morphological features as A. microstictum. In addition, the great variability in the size of conidia within each isolate was observed.The importance of wounding for penetration by the fungus or development of Leaf Streak was confirmed. Great diversity was found in both virulence among isolates of A. microstictum and susceptibility of cultivars.Direct injection of fungal spores resulted in rot of tissue, resembling the ones found in plants with Spring Sickness.Chemical control of Leaf Streak with fungicides were tested. Application of one fungicidal product, Benefit (thiophanate-methyl and iprodione), significantly decreased the disease severity, compared to the control. Despitethe extensive labor and the cost of chemical, fungicide application is the most plausible method to control Leaf Streak at this moment, due to lack of details of the disease cycle and mode of penetration."],"dc:format":["application/pdf","p.88","3.39 MB"],"dc:identifier":["http://rave.ohiolink.edu/etdc/view?acc_num=osu1364222371"],"dc:language":["English"],"dc:publisher":["The Ohio State University / OhioLINK"],"dc:rights":["unrestricted","This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws."],"dc:subject":["Plant Pathology"],"dc:title":["Aureobasidium Microstictum (Bubak) Cooke, The Casual Agent of Leaf Streak of Daylily (Hemerocallis L.), and Its Involvement in Spring Sickness of Daylily"],"dc:type":["Electronic Thesis or Dissertation"],"thesis:degree_discipline":["Plant Pathology"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["The Ohio State University"]},"updated_at":"2026-07-24T03:37:01Z"}