Controlled release formulation of mosquito larvicide with biodegradable ingredients
George, N.; Sujatha, C.H.; Kalyanasundaram, M.
Indian Journal of Medical Research 86: 728-732
1987
ISSN/ISBN: 0019-5340 PMID: 3450597 Document Number: 292685
Controlled release formulation of fenthion, an organophosphorus larvicide, with easily biodegradable carrier materials like 'Jiggieth' (the powdered gummy parts of the plant material as binding agent), cork powder and plaster of paris was developed. This formulation with 4 g of fenthion (82.5% EC) per pellet when released at the rate of 1 pellet/100 1 of breeding habitat was found to be effective for 32-37 days in cesspits, 37 days in soak pits and 27 days in septic tanks against Culex quinquefasciatus. Release profile studied by HPLC indicated that the concentration of the insecticide could be maintained between 0.05 and 0.45 mg/l with an average release concentration of 0.2 mg/l which is sufficient to produce 100 percent mortality against all the different vector species. The loss in the insecticide was reduced significantly by an additional incorporation of 0.2 percent of an antioxidant, 2, 6-ditertiarybutyl p-cresol.