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KobayashiHideka1998 jrm.pdf (3.39 MB)

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Aureobasidium Microstictum (Bubak) Cooke, The Casual Agent of Leaf Streak of Daylily (Hemerocallis L.), and Its Involvement in Spring Sickness of Daylily

Kobayashi, Hideka
http://rave.ohiolink.edu/etdc/view?acc_num=osu1364222371

Abstract Details

1998, Master of Science, Ohio State University, Plant Pathology.
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 considered to 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. hemerocalli generally 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. Despite the 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.
Richard M. Riedel (Advisor)
88 p.
Plant Pathology

Recommended Citations

Citations

  • Kobayashi, H. (1998). Aureobasidium Microstictum (Bubak) Cooke, The Casual Agent of Leaf Streak of Daylily (Hemerocallis L.), and Its Involvement in Spring Sickness of Daylily [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1364222371

    APA Style (7th edition)

  • Kobayashi, Hideka. Aureobasidium Microstictum (Bubak) Cooke, The Casual Agent of Leaf Streak of Daylily (Hemerocallis L.), and Its Involvement in Spring Sickness of Daylily . 1998. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1364222371.

    MLA Style (8th edition)

  • Kobayashi, Hideka. "Aureobasidium Microstictum (Bubak) Cooke, The Casual Agent of Leaf Streak of Daylily (Hemerocallis L.), and Its Involvement in Spring Sickness of Daylily ." Master's thesis, Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1364222371

    Chicago Manual of Style (17th edition)

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This open access ETD is published by The Ohio State University and OhioLINK.