Incidence and severity of daylily leaf streak caused by Aureobasidium microstictum

Over 350 daylilies (Hemerocallis spp.) were evaluated for incidence and severity of leaf streak caused by Aureobasidium microstictum. Plants were established at the Waterman Agricultural and Natural Resources Laboratory, Columbus, Ohio in 2002. Symptoms varied from small spots to large elongate necr...

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Bibliographic Details
Published in:Phytopathology 2009-06, Vol.99 (6), p.S71-S71
Main Authors: Lewandowski, D J, Kelly, M R, Schafer, J, Rhodes, L H
Format: Article
Language:English
Subjects:
Aureobasidium
Hemerocallis
Puccinia
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Summary:Over 350 daylilies (Hemerocallis spp.) were evaluated for incidence and severity of leaf streak caused by Aureobasidium microstictum. Plants were established at the Waterman Agricultural and Natural Resources Laboratory, Columbus, Ohio in 2002. Symptoms varied from small spots to large elongate necrotic lesions along the mid-vein that extended from the base to the tip of the leaf. Leaf streak incidence was assessed in a single plant of each cultivar by estimating the percent of leaves with lesions. Disease severity was assessed by rating the amount of blighted foliage due to leaf streak in the entire plant. Incidence and severity were assessed in July 2008 by four independent raters. Standard deviations were calculated to estimate variation among raters and Z-scores were calculated for incidence and severity to estimate relative deviation from the population means. Incidence was positively correlated with severity, although some cultivars with high leaf streak incidence had relatively low severity due to small lesion size. A. microstictum was isolated from samples taken from several cultivars. We did not observe daylily rust (Puccinia hemerocallidis) in any plants.
ISSN:0031-949X