Other superficial symptoms

Corky lesions with halo	Visual diagnosis Scab-like pale brown lesions with halo Putative causes Tobacco necrosis virus (TNV) R. solani (AG5) Streptomyces spp.

Corky lesions without halo	Visual diagnosis Star-shaped cracks, without halo Cause Unknown

Corky spot	Visual diagnosis The lesions form little corky patch Putative causes R. solani or Streptomyces spp. The implication of these pathogens for such symptoms has not yet been demonstrated

Corky plates	Visual diagnosis The lesions form large corky plates Putative causes R. solani or Streptomyces spp. The implication of these pathogens for such symptoms has not yet been demonstrated