Acidovorax citrulli

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Acidovorax citrulli lesions on leaves of Cucumis melo (click on image to enlarge it)
Author(s): David B. Langston, University of Georgia
Source: IPM Images

Acidovorax citrulli (Schaad et al. 1978) Schaad et al., 2008

This gram-negative bacterium infects cucurbits in various regions. E.g. it causes fruit blotch on watermelon and melon. The symptoms include dark lesions on the fruit surface, cracks in the skin and rotting of the flesh. Leaves also develop brownish, often angular lesions. Young seedlings and fruits are most susceptible. Parts of the U.S. experienced destructive outbreaks in watermelon fields during the 1980s. It is also common on cucumber and pumpkin (squash).

Vernacular names
• English: bacterial fruit blotch of cuburbits
watermelon fruit blotch

The disease is seed-borne and the use of clean seeds is considered to be the most effective way of preventing outbreaks and losses.

Synonyms:
Acidovorax avenae subsp. citrulli
Pseudomonas avenae subsp. citrulli
Pseudomonas pseudoalcaligenes citrulli