Safety evaluation of natural products and insecticides to Apis mellifera Linnaeus on mustard.

dc.contributor.advisorSharma, Prem Chand
dc.contributor.authorKUMAR, DAVINDER
dc.date.accessioned2022-02-05T07:15:05Z
dc.date.available2022-02-05T07:15:05Z
dc.date.issued2021-10-08
dc.description.abstractThe present investigations entitled “Safety evaluation of natural products and insecticides to Apis mellifera Linnaeus on mustard” were undertaken during the year 2020-21 in Department of Entomology, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur. Intrinsic toxicity of different treatments including natural products viz., Agniastra, Brahmastra and Tamar lassi, biopesticide, azadirachtin and insecticides viz. acetamiprid, clothianidin, imidacloprid and thiamethoxam was worked out for their safety to A. mellifera workers by contact and oral administration methods. Based on LC50 values to A. mellifera, clothianidin was found most toxic both by contact method and oral administration (LC50 value 6.24 and 0.003 ppm, respectively) followed by thiamethoxam (LC50 value 21.82 and 0.013 ppm) and imidacloprid (LC50 value 239.10 and 0.027 ppm). The LC50 value of azadirachtin was 8305.17 ppm by contact method. The highest LC50 value was 8550.02 ppm by contact method and 11980.7 ppm by oral administration in case of acetamiprid. There was no bee mortality in Agniastra, Brahmastra and Tamar lassi even at 40% concentration of these natural products when tested by contact method. Under field conditions, sprays of natural products, insecticides and azadirachtin on mustard were started at 50 % flowering and repeated at an interval of 10 days. On the basis of 3 sprays, 70.9 per cent reduction in number of bees over untreated check was observed in thiamethoxam after 1 day of spray followed by imidacloprid spray (66.9 %), Brahmastra (48.8 %), Agniastra (45.5 %), Tamar lassi (35.1 %) and azadirachtin (17.4%). In imidacloprid seed treatment there was minimum reduction of 2.7 % in the number of bees over untreated check. After 7 days of spray, the per cent reduction in the number of bees was 35.4 % in thiamethoxam followed by Agniastra (23.0 %), Brahmastra (19.1 %) and imidacloprid spray (16.1 %). The per cent reduction in number of bees was 7.7 % in imidacloprid seed treatment as compared to 1.8 and 1.2 % in Tamar lassi and azadirachtin, respectivelyen_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810181761
dc.keywordsnatural, products,thiamethoxam,imidacloprid,seeden_US
dc.language.isoEnglishen_US
dc.pages63en_US
dc.publisherPalampuren_US
dc.subEntomologyen_US
dc.themeTo evaluate natural products and neonicotinoids for their safety to Apis mellifera workers and to study their effect on foraging activity of honey bees on mustard.en_US
dc.these.typeM.Scen_US
dc.titleSafety evaluation of natural products and insecticides to Apis mellifera Linnaeus on mustard.en_US
dc.typeThesisen_US
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