First Report of Leaf Spot Disease Caused by Colletotrichum siamense on Chrysalidocarpus lutescens in China

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Abstract
Chrysalidocarpus lutescens (Areca palm) is a tropical ornamental plant grown in parks and houses worldwide. In August 2018, leaf spot symptoms were observed on C. lutescens plants in Fujian Agriculture and Forestry University (26°5′16″N 119°14′6″E), Fuzhou, China. Approximately, 60 % of C. lutescens plants were infected with initial symptoms characterized as small dark brown to black spots of 1.5 to 20 mm in diameter with a distinct yellow halo on leaves that gradually changed from circular to elliptical lesions. As the lesion expanded or coalesced, the affected area became blight with a gray color at the center. In severe cases, the whole infected leaf turned orange yellow, dried and fall eventually. For isolation of the pathogen, eighteen infected leaves samples from twelve plants were collected and sterilized with 75% alcohol, rinsed 2-3 times in sterile distilled water, and infected leaf areas were cut into 1 cm pieces, placed onto 2% potato dextrose agar (PDA) and incubated at 25°C for three days. Ob...
Funding Information
  • National Key Basic Research Program of China (2014CB138302)

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