First Report of Leaf Spot of Wild (Diplotaxis tenuifolia) and Cultivated (Eruca vesicaria) Rocket Caused by Alternaria japonica in Italy.

作者: A. Garibaldi , G. Gilardi , C. Bertoldo , M. L. Gullino

DOI: 10.1094/PDIS-04-11-0280

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摘要: Wild (Diplotaxis tenuifolia) and cultivated (Eruca vesicaria) rocket, popular crops in Italy as well many Mediterranean areas, are grown for fresh consumption dish decoration. During fall winter of 2010 to 2011, extensive necroses were observed on leaves D. tenuifolia E. vesicaria that commercial greenhouses Piedmont Liguria (northern Italy). The disease affected 30 40% 60-day-old plants. First symptoms usually black-brown lesions, 1 mm diameter, which progressively turned black. Lesions started the upper side older at leaf margins tips developed a yellow halo. Eventually, lesions also veins stems. A fungus was consistently isolated from infected potato dextrose agar water (15 g/liter) amended with autoclaved rocket tissues (100 g/liter). After 12 days growth 22°C 12-h dark/12-h light, conidia produced dark brown, obclavate, ob...

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