Plant Disease
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First Report of Alternaria tenuissima Causing Leaf Blight on Sugarcane in China

Publication Date Nov 17, 2020

Abstract

Sugarcane (Saccharum officinarum L.) is the main sugar crop in China. Yunnan is the second largest sugarcane production province in China. In December 2018, leaf blight was first observed on almost every leaf of sugarcane on ‘Huanan 54-11’, ‘Baimei’ and ‘Chongan’ in Kaiyuan (103°27′ E, 23°72′ N), Yunnan. In October 2019, during our survey in the field in Lingcang (100°08′ E, 23°88′ N), Yunnan, this disease was also observed on ‘ROC 25’. Symptoms of the disease initially appeared as wilted, which seemed to be cause by water stress. As the disease progressed, irregular straw-yellow and blighted lesion ran throughout the leaf lamina from leaf tip to entire leaf sheath, many small black conidia formed in the dead leaf tissue under humid conditions. Symptomatic leaf tissues were surface-sterilized with 70% ethanol for 30 s, 0.1% HgCl2 for 1 min, and rinsed with sterilized water three times, air dried on sterile filter paper, and plated on potato dextrose agar (PDA). Six isolates were obtained from six symptomatic leaf samples and were transferred onto potato carrot agar (PCA). Colonies on PDA were white with loose aerial hyphae at first, then turned to dark olive or dark. Colonies on PCA were grayish with sparse hyphae, then turned to dark gray. Conidiophores were brown, simple or branched, and produced numerous conidia in short chains. Conidia (n = 50) were obclavate to obpyriform or ellipsoid, brown to dark brown, with a cylindrical short beak at the tip (2.3 to 17.3 µm in length), and 15.3 to 46.6 μm × 4.2 to 17.9 μm, 2 to 7 ...

Concepts
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Potato Carrot Agar
Control Of Sugarcane Pests
CBS Fungal Biodiversity Centre
Potato Dextrose Agar
Dead Leaf Tissue
Sugarcane
Internal Transcribed Spacers
Blight
Yunnan
Alternaria Tenuissima

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