Cochliobolus carbonum pathogenic to rice
In Japan experiments showed that Cochliobolus carbonum (EPPO A2 organism) which was originally reported as a maize pathogen only, also shows a high pathogenity to rice. Race 3 of the pathogen produces spore germination fluids which are specifically phytotoxic to rice leaves and cause a leaf chlorosis of the leaf as well as enable non-pathogenic Alternaria alternata and Cochliobolus victoriae to infect the leaf tissue.
Sources
Xiao, J.Z. ; Tsuga, F. ; Doke, U. ; Nakabuka, S. ; Tsuda, M. ; Nishimura, S. (1991) Rice-specific toxins produced by Bipolaris zeicola, race 3 ; evidence for role as pathogenicity factors for rice and maize plants. Physiological and Molecular Plant Pathology 38, 67-82