Virulence of Colletotrichum gloeosporioides isolates from wild Stylosanthes spp. populations

Abstract

The objectives of this work were to determine the virulence/avirulence pattern and the races of 274 isolates of Colletotrichum gloeosporioides from wild populations of Stylosantes spp. from the states of Goiás, Bahia and Minas Gerais, in 12 differential plants as well as to group the isolates according to of their similarity in virulence. Monosporic cultures of the isolates were inoculated onto 12 accessions of differential plants. Results (virulence/avirulence) were surveyed ten days after inoculation. Most Brazilian isolates of C. gloeosporioides from wild populations of Stylosanthes spp. presented low virulence capacity, the predominant race does not present virulence to any of the accessions of differential plants evaluated and besides there is no pattern of virulence variability distribution among the isolates by state of origin.