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Leaf-Streak of Daylily: Infection, Disease Development, and Pathological Histology. James A. Spencer, Associate Plant Pathologist, Department of Plant Pathology and Weed Science, Mississippi Agricultural and Forestry Experiment Station, State College 39762; Phytopathology 63:864-866. Accepted for publication 16 January 1973. DOI: 10.1094/Phyto-63-864.

Infection of daylily plants was obtained when spore suspensions of Collecephalus hemerocalli were applied to wounded leaves and to nonwounded leaves, where the fungus gained entrance through stomates and by direct penetration of the leaf surface. At 23 to 28 C with adequate moisture, disease development was extensive and the fungus grew throughout affected leaves. Sporulation was heavy under favorable conditions and dissemination of inoculum was promoted naturally by splashing water and leaf movement. The fungus persisted through unfavorable environmental conditions as thickened, pigmented mycelium or as hard, black, sclerotialike bodies within dead leaves.