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IPM Scouting in Herbaceous Perennials

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Daylily leaf streak
IPM scouting in herbaceous perennials > daylily leaf streak
Pathogen: Collecephalus hemerocalli.

Hosts: Hemerocallis.

Symptoms: Elongated brown lesions, which are lengthwise on the foliage, surrounded by a chlorotic halo. Lesions that affect the midrib of a leaf cause the leaf to senesce from the lesion to the leaf tip. Tissue in the center of the leaf becomes necrotic, creating a dead streak down the middle of the infected leaf. Flower production may be decreased.

Spread: Diseased plant material can introduce the pathogen into a production area. C. hemerocalli produces wind-borne spores on infected leaves. Sclerotia, an overwintering structure, are produced on dead or dying foliage.

Management: Cultivars vary in their susceptibility. Remove dead foliage from the preceding year. Poorly managed plants in overcrowded growing situations are more likely to become diseased. The disease is more severe early in the growing season. Temperatures above 90°F limit disease development.
Daylily leaf streak Leaf streak symptoms in planting bed
The disease was named for the streak symptoms along the leaf’s midrib. Leaf streak symptoms are readily visible in a planting bed.
Tan leaf spots Severely infected leaf
Initial symptoms are tan leaf spots surrounded by chlorotic halos. Severely infected leaf.
This information was developed from A Pocket Guide for IPM Scouting in Herbaceous Perennials by Jan Byrne and Raymond A. Cloyd. Purchase this in a pocket-sized guide for reference in the orchard from MSU Extension (publication E-2981).
The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the Michigan Agricultural Experiment Station, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.
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Updated 9/28/07