On tomato leaves, bacterial speck lesions (P. syringae pv. tomato) look similar initially but are surrounded by a more distinct yellow halo.
Lesions on fruits begin as tiny, slightly raised blisters (Fig. 2A,B).
Subsequently, the spots increase in size and become brownish, scab-like, raised and surrounded by a water-soaked halo.
Several lesions can coalesce. On tomato fruits, P. syringae pv. tomato causes smaller, blackish lesions without a scab-like appearance.