Varietal Screening for Tolerance Against Leaf Roller of Mungbean Under Field Condition

An experiment was carried out in the farmer’s field at Sonakhali, Barguna sadar, Barguna of Bangladesh during January to April 2016 to evaluate different varieties of mungbean against leaf roller in order to find out tolerant/less susceptible varieties of mungbean. Results revealed that all varieties regarding leaf roller population the variety, local Mung, IPSA Mung-5, BU Mung-2 and BINA Mung-2 had highest population of leaf roller and were highly susceptible varieties to leaf roller. The varieties, BARI Mung-2, GK Mung-27, BU Mung-1 and IPSA Mung-12 had lowest population of leaf roller, which indicated that these varieties were least susceptible to leaf roller. Among all tested varieties, none showed complete resistance against leaf rollers but BARI Mung-5 and BARI Mung-6 showed comparatively better resistance against leaf roller. The highest population of leaf roller/m2 (7.0) plants in the field was observed in the 2nd week of March and then declined gradually up to the 4th week of March in 2016. BARI Mung- 6, BINA Mung-2, BU Mung- 1 and local Mung varieties had the highest percent leaf area damage by leaf roller while IPSA Mung-5, GK Mung-27, BARI Mung-5 and BU Mung-2 varieties had the lowest percent leaf area damage by leaf roller. There was a strong negative correlation between number of leaf roller and yield. J. Asiat. Soc. Bangladesh, Sci. 50(1-2): 1-15, June-December 2024