Comparative field efficacy of newly developed formulations of larvicides against Aedes aegypti (L.) (Diptera: Culicidae).
Aedes aegypti (L.) is known as vector of dengue and chikungunya fever. Larvicides are used to control this vector. We evaluated the efficacy of newly developed formulations of larvicides to control Ae. aegypti under field conditions for 24 weeks post single application. Mosdop P and Mosdop TB containing diflubenzuron (2% and 40 mg/tablet, respectively) as the active ingredient, were applied at a dosage of 0.1 mg a.i./1 and Mosquit TB10, Mosquit TB100 and Temecal containing temephos (1%, 10% and 1%, respectively) as the active ingredient were applied at a dosage of 1 mg active ingredent (a.i.) to 200 liter water storage jars. Two water regimens were used in the jars: in one regimen the jar was kept full of water all the time and in the other regimen a full jar had half the volume removed and refilled weekly. The larvicidal efficacy was reported as the level of inhibition of emergence (IE%) calculated based on the pupal skins in the jars versus the original number of larvae added. Mosdop P, Mosdop TB, Mosquit TB10, Mosquit TB100 and Temecal showed complete larvicidal efficacy (100% IE) in the constantly full jars for 16, 17, 14, 20 and 13 weeks posttreatment, respectively; in the jars where half the volum of water was replaced weekly, the larvicides had complete larvicidal efficacy (100% IE) for 19, 20, 17, 24 and 15 weeks post-treatment, respectively. The five larvicide regimens evaluated in this study are effective for controlling Ae. aegypti larvae.
National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Nonthaburi. usavadee.t@dmsc.mail.go.th
Usavadee
U
Thavara
National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Nonthaburi.
Apiwat
A
Tawatsin
National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Nonthaburi.
Jakkrawarn
J
Chompoosri
National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Nonthaburi.
Payu
P
Bhakdeenuan
National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Nonthaburi.
Chayada
C
Khamsawads
National Institute of Health, Department of Medical Sciences, Ministry of Public Health, Nonthaburi.
Somchai
S
Sangkitporn
Department of Parasitology, Faculty of Medicine, Chulalongkorn University, Bangkok.
Padet
P
Siriyasatien
Department of Statistics, Faculty of Commerce and Accountancy, Chulalongkorn University, Bangkok.
Preecha
P
Asavadachanukorn
Department of Project Development, Project Field Co, Ltd, Bangkok, Thailand.
Saibua
S
Boonmuen
Department of Entomology University of California, Riverside, USA.
Mir S
MS
Mulla
D000330:Aedes / Q000187:drug effects*; D000818:Animals; D004132:Diflubenzuron / Q000494:pharmacology*; D007303:Insect Vectors / Q000187:drug effects*; D007306:Insecticides / Q000494:pharmacology*; D007814:Larva / Q000187:drug effects; D009032:Mosquito Control / Q000379:methods*; D000002:Temefos / Q000494:pharmacology*; D013997:Time Factors; D014867:Water
D007306:Insecticides; D014867:Water; D004132:Diflubenzuron; D000002:Temefos