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Birsa Agricultural University, Ranchi

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Subject: Entomology × Author: Sneha Bharti × End date: 2023 × Start date: 2023 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Population Dynamics and Strategic Management of Sweet Potato Weevil (Cylas formicarius Fab.)
    (Birsa Agricultural University, Ranchi, 2023) Sneha Bharti; M.K. Chakravarty
    Sweet potato (Ipomoea batatas) is one of the most common staple food crop of Jharkhand. Sweet potato is attacked by wide range of pests right from germination to harvest, among them the sweet potato weevil is the most damaging pest. The current study entitled on “Population Dynamics and Strategic Management of Sweet Potato Weevil (Cylas formicarius Fab.)” was carried out at the Vegetable Experiment Unit, Department of Horticulture, Birsa Agricultural University, Ranchi, Jharkhand, during Rabi, 2021-22, to understand population dynamics of sweet potato weevil (Cylas formicarius) in relation to abiotic and biotic factors, screening of different varieties of sweet potato and Bio-efficacy of insecticides and bio-pesticides against sweet potato weevil. Based on the findings, C. formicarius was trapped in pheromone traps after 10 days of crop transplanting and then gradually increased and reached its peak population in the 12th SMW, 2022. The correlation analysis revealed that the weevil population had significant negative correlation with rainfall (mm) (-0.492*) and significant positive correlation with maximum temperature (°C) (0.441*) and Sunshine hour (0.624**) whereas the populations of sweet potato weevil had non-significant correlation with minimum temperature (0.184) and relative humidity at 7 AM (-0.288) and relative humidity at 2 PM (0.275). Among the 13 varieties used for screening, Bhu Sona yielded the highest and the variety Cross-4 was the lowest yielder. Vine and tuber infestation was also maximum in Cross-4 and minimum in Bhu Sona. The efficacy of different treatment combination against C. formicarius revealed that the combination of vine treatment with Imidacloprid 17.8 SL @ 1ml/l water and followed spraying of neem oil @ 5% was recorded the most effective whereas only vine treatment with Imidacloprid 17.8 SL @ 1ml/l water was recorded to be the least effective. Highest yield was recorded in combination of vine treatment with Imidacloprid 17.8 SL @ 1ml/l water followed by spraying of neem oil @ 5%, and highest cost benefit ratio (1:11.55) was recorded in the vine treatment with Imidacloprid 17.8 SL @ 1ml/l water + Spraying with Azadirachtin @ 10,000 ppm. From the study conducted we can say that the farmers can use the combination of vine treatment with Imidacloprid 17.8 SL @ 1ml/l water followed by spraying of neem oil @ 5% because of its high efficiency in controlling C. formicarius as well as leaving no residue in the soil. The variety Bhu Sona can be grown by the farmers as the weevil infestation recorded is the least which results in maximum production.