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PESTS & DISEASES

13450 Willandale Road | Rogers, MN 55374-9585 | 763-428-7601

Pests & Diseases

Leaf Streak Disease Revisited
Norman T Baker PhD and Gary W Simone, PhD

The fungus causing Leaf Streak Disease Collecephalus hemerocalli (Spencer 1968, 1972, 1973), has been shown to be Aureobasidium microstictum (syn. Kabatiella microstictum) (Yoshikawa and Yokoyama 1987 and Hermanides-Nijihof 1977). Aureobasidium microstictum infects the leaves of daylilies and Lily-of-the-Valley (Convallaria), and apples (Drozdovskii and Romanchenko 1995). Although Yoshikawa and Yokoyama (1987) have proposed that this disease have the com-mon name Leaf Blight, the name Leaf Spot or Leaf Streak is more commonly used. This disease has been reported from nearly everywhere daylilies are grown (Lyons 1993; Holcomb 1976; Rhoades 1974; Smith and Spencer 1976; Mansfield-Jones 1973; Yoshikawa and Yokoyama 1987; and Darrow 1997) and is cosmopolitan. Alfieri et al. (1994), also report Aureobasidium pullulans from daylily leaves. Ellis (1971) reports A. pullulans is also cosmopolitan. One other fungus specific to daylil-ies is Cercospora hemerocallidis and is apparently found only in North America (Farr et al., 1989).
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Daylily Rust: A New Fungal Disease Infects Daylilies
Norman T Baker PhD

Daylilies are the most popular sun perennial in North America. Their ease of culture, reliable performance in the garden, and their adaptability to almost any garden soil makes them a wonderful perennial. That reputation may be in jeopardy because of a disease new to North America.

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