VARIETAL PREFERENCE AND MANAGEMENT OF SWEET POTATO WEEVIL (Cylas formicarius) THROUGH BIOPESTICIDES UNDER CHANGING CLIMATE
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Date
2023
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RPCAU, Pusa
Abstract
The present investigation "Varietal Preference and management of sweet potato weevil (Cylas formicarius) through biopesticides under changing climate" was conducted during the Kharif season 2022 at the Research farm of Tirhut College of Agriculture, Dholi, Muzaffarpur, Bihar. The study focused on the evaluation of different varieties of sweet potatoes upon the attack of the sweet potato weevil, Cylas formicarius, the effect of meteorological parameters as well as bio-physical characteristics of different varieties. Also, the effect of different bio-pesticide on sweet potato weevil had been studied.
Among different varieties evaluated during this trial, Rajendra Shakarkand-07 (29.70 %) and Rajendra Shakarkand-47 (29.24 %) have performed well with lesser vine infestation as well as tuber infestation of weevil. In the first case, the Rajendra Shakarkand-5 (19.90 %) showed the least mean per cent vine infestation as well as tuber infestation whereas, the Cross-4 (46.13 %) variety showed maximum damage regarding mean per cent vine and tuber infestation.
In the second case, the biophysical basis evaluation had been conducted. There no significant relationship between different plant and tuber characteristics had been established except tuber infestation with the depth of the tuber (-0.126*) and their neck length (-0.072NS). The shape of the tubers also affected the infestation of weevil in the tubers. Also, the girth of the vine or vine thickness is affected by the weevil damage or mean percent vine infestation.
In the third case, the efficacy of various bio-pesticide along with conventional usage of chemical pesticides have been evaluated. Among the bio-pesticides, Beuvaria bassiana (61.42 %) gives the best output along with Heterorhabitdis bacteriophora (53.16 %). They also give the second and third highest benefit-cost ratio among all treatments. The conventional usage of chlorpyriphos 20 % EC (2.8:1) gives the best output, but in this case, the output of Beuvaria bassiana (2.4:1) and Heterorhabitdis bacteriophora (2.1:1) are comparable with the conventional usage. So, it may be used as an alternative to the conventional (2.8:1) or regular pesticides.