OAR@ICRISATPathogenic variability and vegetative compatibility among isolates of Colletotrichum graminicola and C. gloeosporioids causing foliar and grain anthracnose in sorghumKMathurauthorR PThakurauthorV PRaoauthorColletotrichum graminicola and C. gloeosporioides cause foliar and grain anthracnose of sorghum. Foliage infection is more widely prevalent, but at times, grain anthracnose occurs in severe form. To understand whether isolates infecting foliage (lamina and midrib) and that infecting grain are different, isolates from foliage and grain were compared for pathogenicity and vegetative compatibility. In greenhouse experiments, isolate x host differential interaction was highly significant indicating isolate specificity for infection to grain and foliage. Five popular sorghum hybrids also exhibited variable reactions to foliar and grain isolates. The results suggest that although isolates from grain, leaf lamina and midrib can infect both foliage and grains, the organ specificity for infection does exist, and that resistance to grain and foliar infection is likely to be governed by different genetic factors. The isdlates also varied in developing nitrate non-utilizing (nit) mutants on chlorate media and were identified in different vegetative compatibility groups. The isolates of C. graminicola were different from that of C. gloeosporioides both for pathogenicity and vegetative compatibility.Sorghum2000Indian Phytopathological SocietyArticle

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