Pathogen identification of bacterial fruit blotch of watermelon in Fujian.
Watermelon has been attacked in recent years by a bacterial disease called bacterial fruit blotch in some planting areas of Fujian, China, in 2004. This disease damaged fruits and leaves of watermelon. Twenty strains were isolated from diseased fruits and leaves of watermelon. Inoculation on young watermelon with these isolates produced the same symptoms as naturally infected plants. The same strains were isolated from the inoculated watermelon. The symptoms of this disease were described. Based on stain reactions and morphological, cultural, physiological and biochemical properties of the pathogens, all tested isolates were identified as Acidovorax avenae subsp. citrulli. Inoculations with these strains on leaves of cucumber, towel gourd, tomato, maize and soyabean produced the same symptoms.