Vol. 12, Issue 7 (2023)

Author(s):
Hari Om Shukla and Shashi Tiwari

Abstract:
India contributes nearly 90% of the total world production of pigeon pea but various diseases and pests are affecting this crop and reduce its productivity. Hence the present studies on the variability in the five isolates of F. udum were collected from different districts of Uttar Pradesh Morphological and cultural variability in comparative wet and dry mycelium weight were taken and range were observed from (0.707 to 3.713 and 0.167 to 0.707 gm) on potato dextrose broth medium after 10 days at 27±2 °C. Comparative radial growth rate ranged from 18.00 to 48.33 mm after 96 hrs after incubation at 27±2 °C on potato dextrose agar medium and antagonistic effect in dual culture techniques after 96 hrs of incubation, the inhibition percent of F. udum ranged between 16.00 to 27.34 mm, reduction percent of five isolates of F. udum ranged between 31.3 to 53.6 against Trichoderma viride (local strain). The size of micro and macro conidia also observed ranged from 2.5 x .50 to 3.5 x .75 um and 15.28 x 2.2 to 28.0 x 2.9 um.