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Background  Insect growth regulators (IGRs) are considered a novel group of insecticides to control mosquitoes. Novaluron is an IGR with benzoylphenyl urea insecticide, which inhibits chitin synthesis in insects and can reduce insect population density; it is also known to have a high margin of safety for mammals.    Methods  The effective minimum concentration of novaluron formulation EC10 was tested. Six pineapple plantations [control ( n  = 3) and test ( n  = 3)] were selected from Meerigama Medical Officer of Health area in Gampaha District, Sri Lanka. Fifteen plots (10 × 10 m) were demarcated in each site with a 200 m distance apart. Leaf axils of 450 pineapple plants (30 plants × 15 plots) were screened for immature stages of  Aedes  mosquitoes weekly for 12 weeks. The required concentration (20 ppm) of novaluron was sprayed onto the selected pineapple plants ( n  = 1350) individually in 3 selected test sites for 5–10 s. The reduction in the vector population was interpreted as the percentage of reduction in immature stages of  Aedes  mosquitoes.    Results  The 100% mortality of the  Ae. aegypti  larvae within 24 h was observed at 20 ppm (0.05 ml of novaluron 100 g/l in 250 ml of water) as the minimum dose. Variation in the number of  Aedes  larvae present in the control and intervention sites was found to be significantly different throughout the entire observational period ( χ  2  = 128.29,  df  = 11,  P  &lt; 0.001). The total elimination of  Aedes  larvae continued for up to 2 weeks and a 50% reduction was observed until the 8th week.    Conclusions  The present study emphasizes that novaluron (10% EC) can be used as an effective larvicide at the treatment dose of 20 ppm. The residual effect of the IGR lasted for 12 weeks with a functional efficacy of 8 weeks. The 100% reduction of larval breeding was observed up to the 2nd week after application and the percentage reduction of immature stages remained &gt; 50% until the 8th week. The lowest reduction (34.2%) was observed at 12 weeks after the initial treatment. Therefore, re-treatment may be recommended based on the reduction in the efficacy of the IGR.

parasites and vectors

Field-based evaluation of novaluron EC10 insect growth regulator, a chitin synthesis inhibitor against dengue vector breeding in leaf axils of pineapple plantations in Gampaha District, Sri Lanka