FIGURE 2.

Field symptoms of Goss's wilt caused by Clavibacter nebraskensis on aerial parts of maize plants. Aerial symptoms include large, tan‐to‐grey elongated oval leaf lesions (a) that run parallel to the leaf veins (b), which could result in severe blighting or plant death (c). Bacterial colonization of stems during systemic infection can be identified as orange discolouration that may darken to brown or black (d) and be slimy as the infection progresses (e). Early infection of seedlings may result in wilt and plant death (f). While the leaf blight phase may occur at any stage of growth (g), the wilt phase of the disease is less common and usually occurs on severely blighted plants (h). The pathogen produces an extracellular polysaccharide exudate that can ooze out of infected leaf tissue and frequently is found on the surface of infected leaves (i)