Abstract
Teak (Tectona grandis Linn. f.), belonging to Lamiaceae, is one of the most precious timber species. In May 2015, a severe canker was found on stems of teak saplings in an orchard in Pubei County, Guangxi Province, China. Twenty-seven percent of saplings (about 7 cm diameter at 1.4 m height) were infected in this site (2 hectares) and the disease was also found in four otherorchards in Guangxi. The bark of infected stems first turned brown, then became gray followed by cracking. As lesions expanded, sunken cankers appeared and eventually the tree died. Stems of diseased plants took a red color. On potato dextrose agar (PDA), a fungus was isolated from 92% of 25 samples collected on the stem of three cankered saplings. Samples were surface sterilized in 75% ethanol for 30 s and then in 2.5% sodium hypochlorite for 2.5 min. The colonies on PDA showed sparse white mycelium. Microconidia, produced 7 days after incubation (DAI) at 25 °C on PDA, were oval, ellipsoid, reniform, fusiform and aseptate, 5.12 to 12....
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