Stemphylium lycopersici에 의한 칼란코에 점무늬병

Abstract

Leaf spot disease of Kalanchoe (Kalanchoe blossfeldiana) occurred at the farmer’s vinly house in Gangseo-gu, Busan Metropolitan City, Korea, 2006. The diseased plants with typical symptom were collected and the casual agent were isolated. Its mycological characteristics and pathogenicity were examined. The results were as follows. The typical symptoms of the disease appeared as small brownish or dark brown spot on both sides of the leaves. The spots tended to develop from lower leaves. The spots gradually enlarged into conspicuous necrotic lesions 1-5 mm in diameter. Colonies of the causal fungus formed on potato dextrose agar were velvety, gray or grayish brown in color. Conidia were cylindrical or obclavate to oblong in shape, brown in color, 24~65 × 12~23 μm in size and had 1-4 transverse septa, The optimum temperature for growth of the fungus was about 25~30oC. Conidiophores were brown in color, 32~135 × 4~8 μm in size and had 1-7 transverse septa. The fungus was identified as Stemphylium lycopersici (Enjoji) Yamamoto based on its symptom and mycological characteristics. This is the first report of leaf spot of Kalanchoe caused by S. lycopersici in Korea.