Vol. 10, Issue 10 (2021)

Author(s):
Satyendra Nath Singh, Yogesh Kumar and Dheeraj Kumar Singh

Abstract:
Leaf blight of wheat (Bread wheat - Triticum aestivum) is mainly caused by Helminthosporium sativum (Pammel, King & Bakke) in India and neighbouring south asia countries and capable of causing losses in yield up to 50% in susceptible variety as well as results poor grain quality. With a view to find out effect of toxin produced by different isolates of H. sativum (H_1, H₂, H₃, H₄ and H₅), their crude toxin were evaluated against germination of wheat seed of cultivar UP 262 at dilutions 1:20, 1:100, 1:200, 1:500 and 1:1000. The observation recorded after 96 hours, showed the dilution 1:20 did not allow seed germination however, 1:100 showed germination which was significantly lower as compared to other dilutions. The observation recorded after 48 and 96 hours of seed treatment showed that the radical and plumule length was drastically reduced in some of the dilutions of crude toxin of all the isolates as compared to check. This study facilitate to screen a number of variety against diasese (resistant/susceptible) within a short period of time.