The class Gammaproteobacteria is one of the largest groups in the bacteria domain containing several important plant pathogens (such as Pseudomonas and Xanthomonas).
Symptoms usually involve necrotic, often water-soaked leaf spots, typically most severe on lower leaves. The spots may be very small at first but develop an angular shape as the movement of the bacteria is limited by leaf veins. Eventually several spots may enlarge, coalesce and cause death of mature leaves.
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