Abstract
Tea (Camellia sinensis L.) is an economically important crop widely cultivated for leaves in China. Leaf and young shoot blights were observed on some commercial gardens of tea (Camellia sinensis, cv. Yinghong IX) in Guangzhou in April from 2013 to 2015, China. The disease occurred initially on the young leaves producing water-soaked spots. When the disease further developed, the spots merged together into large patches and killed the leaf blade. The symptoms developed on the young shoots about two weeks later. Disease incidences ranged from 20 to 30% in the affected fields. Signs of bacterial streaming from all infected leaves were observed under microscope, and no fungal mycelium or spore was found from the diseased areas. Bacterial isolates were obtained by surface-sterilizing small fragments (5 × 5 mm) of symptomatic leaf tissues in 0.5% NaOCl, rinsing the sections in sterilized water twice, and streaking on Luria-Bertani (LB) plates. Bacterial colonies were convex, beige-tan colored, round and non-mu...
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