Bacterial spot of tomato caused by Xanthomonas campestris pv. vesicatoria. The bacterium affects all above-ground plant parts. On the leaves, spots are generally brown and circular. Bacterial spot on tomato leaf caused by Xanthomonas campestris pv. vesicatoria. Foliar symptoms of bacterial spot and speck are almost identical and very hard to distinguish. Image courtesy of Landesanstalt für Pflanzenbau und Pflanzenschutz, Germany. Bacterial spots on tomato fruit. Fruit lesions begin as minute, slightly raised blisters that eventually increase in size and become brown, scab like. These lesions can also be raised around the margins and sunken in the middle. Bacterial spot, closer view. Note water-soaked, brown lesions surrounded by yellow halo. Even though these spots never become very large, they may result in yellowing and dropping of the entire leaflet. Image courtesy of Clemson University - USDA Cooperative Extension.

Bacterial spot on tomato leaves. This bacterium can survive on tomato volunteers and in diseased plant debris. Warm weather favors disease development. Bacterial spot and speck can be differentiated by symptoms on immature fruits. Image courtesy of Landesanstalt für Pflanzenbau und Pflanzenschutz, Germany.