First report of bacterial leaf spot caused by Pseudomonas cichorii on Thai basil in Hawaii.
In October 2017, water soaked, irregular and grey to black leaf spots were observed on Thai basil (Ocimum basilicum var. thyrsiflora) in a home garden in Hilo, Hawaii, USA. Lesions ranged from 2 to 6 mm spots to marginal necrotic areas of 12 mm or larger. The causal pathogen was isolated and identified as Pseudomonas cichorii based on physiological, molecular and pathogenicity analyses. The obtained sequence was deposited in GenBank (accession no. MH396006). This is thought to be the first report of bacterial leaf spot caused by P. cichorii on Thai basil in Hawaii, USA.