Isolation and characterization of three distinct biotypes of the gamma race of Colletotrichum lindemuthianum from white bean

Se aislaron 3 biotipos distintos de Colletotrichum lindemuthianum de una serie de cv. de frijol blanco, los cuales mostraron un rango diferencial de severidad de la enfermedad al inocularlos con la raza gamma. Los biotipos difirieron de la raza gamma parental en su patogenicidad, produccion de esporas y caracteristicas culturales en agar de Mathur. Tambien presentaron diferencias notorias en las caracteristicas de sus colonias en agar de Mathur que contenia una concn. de benomil de 25 mg/litro. Sus diferencias en patogenicidad fueron consistentes y fueron confirmadas mediante reinoculacion. Sin embargo, los biotipos no difirieron significativamente en tasa de crecimiento y tamano de las esporas. (RA-CIAT) spa

Three distinct biotypes of Colletotrichum lindemuthianum were isolated from a series of white bean cv. which showed a differential range of disease severities when inoculated with the gamma race. The biotypes differed from the parental gamma race in pathogenicity, spore production, and cultural characteristics in Mathur's agar. They also exhibited noticeable differences in colony features on Mathur's agar containing a concn. of 25 mg benomyl/liter. Their pathogenicity differences were persistent and were confirmed by reinoculation. The biotypes, however, did not differ significantly in growth rate and spore size. (AS) eng