Xanthomonas cucurbitae (Bryan) Vauterin et al. (Syn. X. campestris pv. cucurbitae) causing bacterial spot is emerging as an important pathogen leading to huge crop losses especially to bottle gourd, pumpkin and squashes (Jarial et al., 2011;Babadoost, 2012;Babadoost, 2017). This disease was first reported as bacterial leaf spot on Hubbard squash in New York in 1925 by Bryan (Bryan, 1930). Since then, the disease has been reported to occur on various cucurbits (