Abstract

G. P. Jagtap and P. L. Sontakke

The morphology of both conidia and setae of Colletotrichum truncatum (Schw.) Andrus and Moore isolates from soybean were compared and found to be distinct. Conidial shape was more useful than size in isolate determination. Average conidial length was maximum (26.46 µm) in isolate Ct-1 followed by Ct-2 (23.75 µm), Ct4 (22.25 µm), Ct-3 (21.72 µm), Ct-5 (20.72µm) and Ct-6 (18.81 µm), whereas the width was maximum (4.63 µm) in isolate Ct-3 followed by Ct-2 (4.12 µm), Ct-4 (3.92 µm), Ct -5 (3.86 µm), Ct-1 (3.67 µm) and Ct-6 (3.56 µm). Average setal length was maximum (166.65 µm) in isolate Ct-1 followed by Ct-2 (122.16 µm), Ct -3 (61.73 µm), Ct-4 (52.58 µm), Ct-5 (47.83 µm) and Ct -6 (44.36 µm) whereas the width was maximum (5.50 µm) in isolate Ct-1 followed by Ct-6 (5.39 µm), Ct-4 (5.37 µm), Ct-5 (5.22 µm), Ct-2(5.07 µm) and Ct-3 (4.92 µm). Total number of setae per fascile was maximum in isolate Ct-1 (158) followed by Ct-3 (125), Ct-4 (115), Ct-5(105), Ct-2 (95) and Ct-6 (48).