PATIL, SUVARNA.KOTIKAL, Y. K.NAIK, RAMACHANDRA K.AMBRISHBHAVIDODDI, ARUN KUMAR.Y. S. MAHESHCHIMMAD, BASAVARAJ RAJASHEKHAR.2023-10-272023-10-272020UHS18PGM1031https://krishikosh.egranth.ac.in/handle/1/5810199760Screening for identification of biophysical and biochemical traits of sweet potato genotypes which imparts resistance against sweet potato weevil, Cylas formicarius (Fab.) (Brentidae: Coleoptera) and its management was carried out at Regional Horticultural Research and Extension Centre, Dharwad, Karnataka during 2019-2020. The results from the screening for identification of biophysical traits of thirty sweet potato genotypes revealed that the genotypes, BSP-39, BSP-36, BSP-1 and Shree bhadra were found to be resistant in recording minimum per cent infestation, highest neck length of vine, minimum infestation length and lowest mean weevil population. Whereas, BSP-32, BSP-31, BSP-33, BSP-28, BSP-24, BSP-30, BSP-38, BSP-38, BSP-34 and BSP-23 were recorded as moderately resistant genotypes. Further, the genotypes, BSP-26, BSP-8 and BSP-15 were found to be moderately susceptible. Genotypes, BSP-10, BSP-19 and BSP-25 were highly susceptible to sweet potato weevil. The biochemical traits like reducing sugar, phenol and starch in tubers which were negatively correlated with level of susceptibility to weevil. Whereas, crude protein and beta carotene in tubers were significantly positive correlation with per cent tuber infestation. Among the different IPM modules for management of sweet potato weevil in the local sweet potato variety, Shree bhadra, Integrated module comprising of i) Soil application of neem cake 250 kg ha-1 in last ploughing before ridge and furrow making, ii) Dipping the vine cuttings in Imidacloprid 17.8 % SL @ 0.5 ml /l for 10 minutes before planting, iii) Earthing up/ re-ridging the crop @ 30 and 60 DAP, iv) Installation of Synthetic sex pheromone traps @ one per 100 m2 v) Root zone application of Beauveria bassiana @ 10 g/ kg of FYM @ 45 DAP, vi) Foliar spray of Emamectin Benzoate 5% SG @ 0.2 g/l @ 65 DAP recorded significantly lower weevil population in vine and tuber, highest male adult weevils trap catch per week, lowest damaged tubers, highest marketable tuber yield and higher net return with highest B:C ratio than Bio-intensive module. Whereas, chemi-intensive module and foliar spay of Malathion 50 % EC @ 2 ml/l were recorded less effective in managing sweet potato weevil.EnglishThesis