title: Evaluation of DursbanR and Dowco 214 as mosquito larvicides in rice-fields.
abstract: Emulsifiable concentrates of DursbanR (chlorpyrifos) and Dowco 214 (chlorpyrifos-methyl) were tested as mosquito larvicides using Hudson knapsack sprayers on small plots of rice-fields on Penang Island. The mosquitoes found in these rice-fields are predominantly Anopheles campestris and Culex tritaeniorhynchus. At dosages of 14, 28 and 56 gm hectare-1, Dursban is effective in maintaining the rice-fields free of Anopheles larvae for at least 2, 3 and 7 days respectively. Dowco 214 at 56 gm hectare-1 is able to keep the fields free of all mosquito larvae for at least 2 days.
mesh_terms: D000818:Animals; D000852:Anopheles; D004390:Chlorpyrifos / Q000031:analogs & derivatives*; D003465:Culex; D007814:Larva; D008296:Malaysia; D009032:Mosquito Control; D012275:Oryza; D011891:Rain; D013696:Temperature
chemical_list: D004390:Chlorpyrifos; C007031:chlorpyrifos-methyl