Comparative Studies on the Larvicidal Action of Novaluron (Mosquiron® 100EC) and Moringa Oliefera (LAM) Seed Oil against Aedes Aegypti (Diptera: Culicidae) Larvae

Abstract

Inhibition of emergence (IE) by Novaluron (Mosquiron 100EC) and Moringa oliefera Lam.(Moringaceae) seed oil (MOSO) was assayed with first and fourth instar larvae of Aedes aegypti (Diptera: Culicidae) at ambient laboratory conditions. graded concentration ranging from 3.125-200µg/ml including a control were tested. Four replicates of each concentration in RCBD were variously challenged with cohorts of 20 active larvae of a given instar. Mortality resulting from eclosion inhibition was recorded at 3-hourly intervals for 12 hours, and data analysed using log/probit transformation. Results indicated dosage-related mortality differences. High concentration of Novaluron gave 95% mortality of both 1 st and 4 th instars, while sublethal dosages resulted in 45 and 35% mortality of 1 st and 4 th instars, respectively. Exposure to Moringa oil resulted in 90 and 100% mortality of 1 st and 4 th instars, respectively, and sublethal dosages gave 30 and 25% mortality, respectively. Both toxicants showed significant (P<0.05) inhibition of emergence following post-treatment culturing. The IE 50 values for 1 st instar larvae were 4.546µg/ml and 15.44µg/ml of Novaluron and Moringa oil, respectively; and 8.028µg/ml and 9.977µg/ml, respectively, for 4 th instar. Although the 1 st instar larave were more susceptible, Novaluron was about twice more potent. Nevertheless, Moringa oil has shown promise as biopesticide for Ae. aegypti larvae control.