Xanthomonas campestris
Xanthomonas campestris is a bacterium that causes a variety of plant diseases, including "black rot" in cruciferous vegetables and bacterial wilt of turfgrass. It is also used in the commercial production of xanthan gum, a high-molecular-weight polysaccharide which has many important uses, especially in the food industry. The former "X. c." pv. "citri", which causes citrus canker, was reclassified as "X. axonopodis" in 1995. In 2006, the species designations for "X. c." pv. "citri" and "X. c." pv. "malvacearum" were revised to "xes. citri" and these pathovars are now referred to as subspecies.