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20192
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Subject: Entomology × Author: Chowdary, Namburi Mounica × Start date: 1992 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    BIOEFFICACY OF NEWER INSECTICIDES AGAINST LEPIDOPTERAN PESTS AND THEIR RESIDUE DYNAMICS ON CABBAGE
    (CSK HPKV, Palampur, 2019-06-18) Chowdary, Namburi Mounica; Sharma, Prem Chand
    Field experiment was conducted at Experimental Research Farm of Department of Entomology, CSKHPKV, Palampur during the rabi season 2018-19 to determine the bioefficacy of insecticides against Plutella xylostella and their residue dynamics on cabbage, variety Pusa Cabbage-1. The bioefficacy of insecticides comprising chlorantraniliprole, cypermethrin, diafenthiuron, emamectin benzoate, indoxacarb, novaluron, azadirachtin, spinosad and Bacillus thuringiensis was determined. After two sprays, chlorantraniliprole @ 10g a.i./ha recorded minimum larval population with 1.21 larvae/plant followed by spinosad @ 15 g a.i./ha (1.43) and indoxacarb @ 40 g a.i./ha (1.6). The treatments with high larval population were azadirachtin (5.56 larvae/plant) followed by Bt (5.47). The per cent reduction of larval population over untreated check was highest in chlorantraniliprole (81.02%), followed by spinosad (78.13%) and indoxacarb (78.02%). The lowest per cent reduction was found in the plots treated with Bt (45.14%) and azadirachtin (45.52%). Incremental cost benefit ratio was maximum (1:18.44) in chlorantraniliprole followed by spinosad (1:16.33) and diafenthiuron (1:13.96). The lowest incremental cost benefit ratio was found with novaluron (1:2.48). The initial deposits of diafenthiuron, indoxacarb and novaluron on cabbage heads were found to be 0.604, 0.309 and 0.218 mg/kg, respectively which were below the quantification limits on 7th day after spray. The half-life values were calculated to be 1.05, 1.73 and 1.14 days, the safety intervals were found to be 0.77, 0.13 and 1.91 days, for diafenthiuron, indoxacarb and novaluron, respectively.
  • Thumbnail Image
    ThesisItemOpen Access
    BIOEFFICACY OF NEWER INSECTICIDES AGAINST LEPIDOPTERAN PESTS AND THEIR RESIDUE DYNAMICS ON CABBAGE
    (CSKHPKV, Palampur, 2019-06-18) Chowdary, Namburi Mounica; Sharma, Prem Chand
    Field experiment was conducted at Experimental Research Farm of Department of Entomology, CSKHPKV, Palampur during the rabi season 2018-19 to determine the bioefficacy of insecticides against Plutella xylostella and their residue dynamics on cabbage, variety Pusa Cabbage-1. The bioefficacy of insecticides comprising chlorantraniliprole, cypermethrin, diafenthiuron, emamectin benzoate, indoxacarb, novaluron, azadirachtin, spinosad and Bacillus thuringiensis was determined. After two sprays, chlorantraniliprole @ 10g a.i./ha recorded minimum larval population with 1.21 larvae/plant followed by spinosad @ 15 g a.i./ha (1.43) and indoxacarb @ 40 g a.i./ha (1.6). The treatments with high larval population were azadirachtin (5.56 larvae/plant) followed by Bt (5.47). The per cent reduction of larval population over untreated check was highest in chlorantraniliprole (81.02%), followed by spinosad (78.13%) and indoxacarb (78.02%). The lowest per cent reduction was found in the plots treated with Bt (45.14%) and azadirachtin (45.52%). Incremental cost benefit ratio was maximum (1:18.44) in chlorantraniliprole followed by spinosad (1:16.33) and diafenthiuron (1:13.96). The lowest incremental cost benefit ratio was found with novaluron (1:2.48). The initial deposits of diafenthiuron, indoxacarb and novaluron on cabbage heads were found to be 0.604, 0.309 and 0.218 mg/kg, respectively which were below the quantification limits on 7th day after spray. The half-life values were calculated to be 1.05, 1.73 and 1.14 days, the safety intervals were found to be 0.77, 0.13 and 1.91 days, for diafenthiuron, indoxacarb and novaluron, respectively.