Pathogenicity tests were carried out on 5-7 week old seedlings of several lines of Stylosanthes. C. dematium showed little pathogenicity. C. gloeosporioides isolated from Townsville developed leaf and stem lesions on S. humilis H. B. and K. (cvs. Lawson, Gordon and Paterson), S. guianensis Sw. (vs. Schofield and Endeavour), S. fruticosa (Retz.) Alston (CPI 34925, 40205, 40289). No lesions developed on S. hamata (cv. Verano), S. scabra Vog. (cv. Seca). S. viscosa Sw. (CPI 34904, 33941), S. sym­ podielis Taub. (CPI 67704) and S. capitata Vog. (CPI 55842). A typical isolate of C. dematium developed lesions to 1 mm diam on S. guianensis (cv. Scofield) and pinprick lesions on C. humilis (cv. Lawson). Our isolate of C. gloeosporioides appears to differ somewhat from Irwin and Cameron's type A, although it is of type A morphology. Evidence for pathogenic specializa­ tion has been gained for C. dematium as well as C. gloeosporioides elsewhere (3). The isolates of C. dematium tested appear to be much less virulent than those studied by Lenne in Florida (2). Our isolates failed to colonize C. hamata (cv. Verano) in glasshouse trials but were isolated from the cultivar in the field. This indicates that preinoculation or inoculation conditions were subop­ timal or that the organism was unable to invade the cultivar due to adverse conditioning of inoculum during growth in the laboratory. Studies are continuing.