Seasonal incidence of lepidopteran pests in French bean was studied at Krishi Vgyana Kendra farm, University of Agricultural and Horticultural Sciences, Shivamogga. During Kharif, the bean pod borer, Maruca vitrata and lablab leaf webber, Omoides indicata was commenced from the first week of September (36^th MSW) and second week of August (32^nd MSW), respectively. The lowest population of M. vitrata was recorded in first week of September i.e., 1.20 larvae per plant (36^th MSW) and highest was recorded in the last week of September (39^th MSW) with 2.30 larvae per plan and showed a significant negative correlation with the minimum relative humidity (r = -0.690), whereas O. indicata population was minimum (0.80) in the second week of August and maximum (1.52) in the last week of September (39^th MSW), however a significant positive effect of maximum temperature was found on the population of O. indicata. During Rabi, M. vitrata incidence started from first week of January (1^st MSW) and continued till January last week (5^th MSW) and O. indicata was first observed during the December second week (50^th MSW). The lowest and highest population of bean pod borer was 0.35 larvae per plant noticed in January first week (36^th MSW) and 1.89 larvae per plant in the third week (3^rd MSW), respectively and these population had significant negative correlation with minimum relative humidity (r = -0.732). The minimum and maximum population of O. indicata was 0.20 and 1.40 larvae per plant recorded in the second week of December (50th MSW) and last week of January (5^th MSW), respectively and got significant positive effect from maximum temperature (r = 0.794). The remaining weather parameters showed non-significant relationship with lepidopteran pest population during both Kharif and Rabi 2019-20.