Laboratory evaluation of lambda-cyhalothrin a microencapsulated formulation on mosquito nets for control of vector mosquitos.
Two formulations of lambda-cyhalothrin (EC-Emulsion concentrate and MC-Microencapsulated) were impregnated into bednets made of polyethylene and polyester. The nets were treated at a dosage of 15 mg/m2. For bioassay of insecticidal efficacy, female Anopheles maculatus and Aedes aegypti were exposed to the nets for two minutes and mortality was scored 24 hours later. The nets were also tested after repeated washings with water and with soap and water. Microencapsulated (2.5CS) formulation was more effective than emulsion concentrate (2.5EC) formulation on both net materials--polyethylene and polyester. Repeated washing with water and soap reduces the efficacy of all bednet treatment combinations. Microencapsulated formulation on polyethylene gave best results; it could sustain up to five washes with water and two with soap and water.
Vythilingam
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Institute for Medical Research, Jalan Pahang, Kuala Lumpur, Malaysia.
Zainal
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AR
Hamidah
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D000330:Aedes; D000818:Animals; D000852:Anopheles; D001512:Bedding and Linens; D001681:Biological Assay; D002626:Chemistry, Pharmaceutical; D004339:Drug Compounding; D004655:Emulsions; D005260:Female; D007306:Insecticides / Q000737:chemistry*; D007846:Laundering; D008855:Microscopy, Electron, Scanning; D009032:Mosquito Control / Q000295:instrumentation*; D009570:Nitriles; D011091:Polyesters; D020959:Polyethylene; D011722:Pyrethrins / Q000737:chemistry*; D013997:Time Factors
D004655:Emulsions; D007306:Insecticides; D009570:Nitriles; D011091:Polyesters; D011722:Pyrethrins; D020959:Polyethylene; C037304:cyhalothrin