First Report of Stem Spots Caused by Alternaria sp. on Berberis sp. in Iran

Plant Disease
S MirabadiS Rezaee

Abstract

During the summer of 2004, approximately 150 Berberis sp. (Berberis thunbergii cv. Rose Glow) showing dark brown, eye-like elongated spots (7 to 22 mm long and 1 to 3 mm wide) on stems near the crown toward the top were observed in a park in Tehran, the capital of Iran. Red and yellow spots on the leaves and defoliation were also recorded for some of the affected plants. A total of 28 samples from 16 individual plants (sampling included all symptomatic parts of the plants) were collected and evaluated for the possible casual agent of the disease. Fungi with spores that are characteristic of the genus Alternaria (2), including dark mycelium and brief and simple conidiophores with catenulate dictyospores, were isolated from the detached leaf and stem pieces of diseased plants. The pathogenicity of five isolates was investigated using Koch's postulate. Twenty cut stems and 10 rooted plants of Berberis sp., with or without wounding on their stems and leaves, were inoculated with the spore suspension (104 spores per ml) prepared by using 10-day-old cultures of the isolates grown on potato dextrose agar at 25°C in the dark. The inoculated cut stems were covered for 3 days with a plastic tent and kept in a greenhouse at 25 ± 5°C with ...Continue Reading

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