Toxic effect of deltamethrin on the life table and development of Helicoverpa armigera (Hubner)
2016
Ahmad, Salman | Ansari, Mohammad Shafiq | Siddiqui, Mohammad Haris
Effect of deltamethrin (Decis 2.8% EC) on the fitness of Helicoverpa armigera (Hübner) was determined using demographic studies. Survivorship (I ₓ) and expectancy (e ₓ) was high with commencement of age and gradually decreased with progression of age in the exposed and unexposed groups. Highest number of unhatched eggs (~20%) was recorded with LC ₅₀ (79.0 mg/L) opposed to 1% in the control. Daily fecundity rate was significantly greater (200 females/day) in the control than 126 in LC ₂₀ (5.13 mg/L). Potential fecundity was lowest (179 females/female/generation) with LC ₅₀ treatment than 675 in the control. Smallest value of intrinsic rate of increase (r ₘ) occurred at LC ₅₀ (0.0393 females/female/day) while the highest value (0.0539) was at control. Overall larval development was significantly reduced to 18.0 days with LC ₅₀ opposed to 24.1 days at control. Pupal period was shortened to 7.6 days with LC ₅₀, while it recorded 9.3 days in control.
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