Characterization of different isolates of Bipolaris/Alternaria causing spot blotch/blight of wheat and their test of pathogenicity
2016
A.K. CHOWDHURY | P.M. BHATTACHARYA, S. BANDYOPADHYAY*, S.K. LAHA,
Spot blotch/blight disease affected wheat leaves/cultures from 12 different locations of India were collected and spore measurement as well as pathogenicity was tested. The highest average length of the conidia of 72.43 µm ± 23.70 was found in WB 10 which was followed by WB 7 (65.01 µm ± 12.55). The highest average breadth of 23.68 µm ± 1.53 was found in WB 6 followed by WB 8 (22.81 µm ± 1.85). The highest no. of septa (8.10 ± 2.64) was found in WB 10 which was closely followed by WB 7 (7.13 ± 0.83). The average size of the lesion was highest in case of isolate WB 10. This isolate produced 3.02 cm ± 0.45 long and 0.66 cm ± 0.102 wide lesion (average) after 72 hours of incubation. A good positive correlation of lesion length with the length of the conidia (r2 = 0.591) was found. But the best positive correlation of lesion length was found with the number of septa in the conidia (r2 = 0.684). So, the study indicates that more number of septa in the conidia makes the isolate more virulent.
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