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Addea Gupta Roopa Rani Samal Sarita Kumar

Abstract

Aedes aegypti, is a well-known vector of dengue, Chikungunya and Zika at the global level. Primary use of pyrethroids as control interventions has caused the development of a considerable level of immunity in Ae. aegypti. The current study assessed the efficacy of a pyrethroid, ?-cypermethrin on the survival and various life parameters of Ae. aegypti. The larvicidal studies with ?-cypermethrin revealed the respective LC50 and LC90 values as 0.26526 mg/L and 0.60211 mg/L. The impact of LC50 level was assessed on the growth and life attributes; such as gonotrophic cycle, egg development, hatchability, development and survival of immature stages, adult longevity, reproduction rate and generation time; of fourth instar of susceptible (S) and ?-cypermethrin-exposed population (E). The exposed population showed diminished fitness as compared to the susceptible population. The individual female fecundity in susceptible population was recorded as 79.6 with 61.6% hatchability rate as compared to the 28 eggs/female and 25% hatchability in the exposed population. The mean egg hatch time in S strain increased by 2-fold in E strain. The proportion of immature survival observed in S strain was 0.88 for fourth instar to pupa (P/I), 0.94 for pupa to adult (A/P) and an overall 0.83 for fourth larva to adult (A/I), which respectively reduced to 0.32, 0.86 and 0.27 in E strain of Ae. aegypti. Likewise, the net reproductive rate, birth rate and death rate were significantly (p < 0.05) higher in S than in E strain. This study demonstrates the negative impact of ?-cypermethrin on the physiological and reproductive fitness of Ae. aegypti.

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Keywords

Aedes, Alpha-cypermethrin, Life-table, Pyrethroids, Larvicidal

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Section
Research Articles

How to Cite

Physiological and reproductive fitness cost in Aedes aegypti on exposure to toxic xenobiotics in New Delhi, India. (2021). Journal of Applied and Natural Science, 13(1), 71-78. https://doi.org/10.31018/jans.v13i1.2470