Stylosanthes guianensis is a diverse tropical and subtropical forage legume of great potential. Foliar blight disease, caused by Rhizoctonia solani AG-1, can be a significant constraint to the legumersquo; s production in some areas. The pathogen has a broad range of host plant species, and can survive as sclerotia for long periods in soil or plant debris. No sources of resistance in Stylosanthes are known. Cost-effective disease management strategies are, therefore, needed for this host-pathogen system. Chitinases, which catalyze