Impact of sublethal conventional and biorational larvicidal stress on fitness status in nutritionally challenged Aedes aegypti larvae

Authors: A Sneha, Shabad Preet
In the present study we manipulated larval stressors (nutritional and larvicidal stress) by fabricating two larval microhabitats under laboratory conditions, aiming to determine the physiological and biochemical fitness of Aedes aegypti larvae. Sublethal exposures (LC10, LC25 and LC50 for 24, 48 and 72 hr) with selected larvicides along with nutritional challenge adversely affected larval developmental process and fitness status of Ae. aegypti larvae viz. prolonged larval and pupal period, larval and pupal deformities, malformations. Maximum significant (P<0.05, P<0.005and P<0.001) decrease of glycogen (14-87%), sugar (32–92%) and lipid (48–92%) content was noticed in Bti, neem oil, permethrin followed by pyriproxyfen and minimum decline with triflumuron treatment. Collectively these findings represented that all applied stressors drastically affected the nutritional status of larvae and hindered larval metamorphosis thereby suppressing the adult emergence.

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