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evealed that the ITS sequence (GenBank accession nos. MT472132) was 100% identical to other P. nicotianae strains (GenBank accession nos. KJ754387). To fulfill Koch's postulates, a 50 ml zoospores suspension (106 spores/ml) of B2 was sprayed on the foliage of three 1-year-old healthy seedlings. Sterile distilled water to inoculate control plants. After 10 days, typical symptoms of dark brown spots were observed on all the inoculated leaves, while the control leaves remained asymptomatic. P. nicotianae was re-isolated from the inoculate
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