OAR@ICRISATVariation in morphology and pathogenicity in Claviceps fusiformis, the causal agent of pearl millet ergotS SChahalauthorV PRaoauthorR PThakurauthorIsolates of the pearl millet ergot pathogen Claviceps fusiformis were collected from eight locations in India and studied for morphological and pathogenic variations. Sclerotia were examined for shape, size and cavities, and residual macro-and microconidia for their size and viability. Sclerotia from Aurangabad and ICRISAT Centre were the largest (5× 2.5 mm) and heaviest (1.4g/100 sclerotia), and from Mysore the smallest (3 × 2 mm) and lightest (0.4 g/100 sclerotia). The average number of cavities (furrows) was minimum in the Mysore collection (4/sclerotium) and maximum in the Kovilpatti collection (15/sclerotium). Large variations occurred in size and ratios between the number of macro- and microconidia residual on sclerotia from different locations. Time to initiation of germination of macroconidia from sclerotia in sterile distilled water at 25 °C varied from 24 h in Aurangabad and Jobner collections to 50 h in the Kovilpatti collection. The macroconidia of the Pune collection did not germinate. The isolates differed in growth characteristics on Kirchoff's agar at 25°. In a pathogenicity test using 10-day-old culture inoculum in six pearl millet genotypes (3 resistant and 3 susceptible), some isolates were more virulent than othersMillets1985ElsevierArticle

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