Vol. 7, Issue 9, Part G (2025)

The present study entitled “Investigations into leaf rust of wheat incited by Puccinia triticina Eriks” Based on the results in the seedling resistance test out of 23 wheat varieties 03 resistant varieties were found namely NIDW 1149, NIAW 3624 and NIAW 1415. 
In the adult plant resistance test out of 23 wheat varieties 06 wheat varieties were found resistant to leaf rust whereas, 03 wheat varieties were found moderately resistant to leaf rust. While 05 wheat varieties had shown moderately susceptible reaction to leaf rust. Although 09 wheat varieties had shown susceptible reaction to leaf rust.
Studies on adult plant resistance by AUDPC, out of 23 wheat varieties none of the variety was found immune while, 13 wheat varieties expressed values of "AUDPC" less than 100 whereas, 05 wheat varieties expressed values of "AUDPC" between 101 to 200 against leaf rust. This indicates that considerable amount of resistance against leaf rust. 3 wheat varieties expressed value between 201 to 300 while 2 wheat varieties expressed “AUDPC” value above 500. These wheat varieties had shown susceptibility against leaf rust.
Epidemiological study showed that the first incidence of disease was noticed in 1st meteorological week (First week of January 2025). The maximum ACI was observed 80 in 6th Meteorological week (Second week of February 2025). Then it was declined. The data revealed that, the maximum temperature and morning humidity showed positive correlation. In case of minimum temperature and evening humidity showed negative correlation.