 As of 2004 though, a new classification system was proposed that would change the name of "X. campestris pv vesicatoria" to "X. euvesicatoria" (previously group A), and recognized the species "X. vesicatoria" (group B), "X. perforans" (group C), and "X. gardneri" (group D).These changes have yet to be fully recognized, so this article will include information on all groups (A, B, C, and D) of bacterial leaf spot causing Xanthomonads.The principal hosts of BLS causing Xanthomonads are tomatoes and peppers, though other incidental hosts have been recorded, mainly weeds.