Efficacy of a new combined larvicidal-adulticidal ultralow volume formulation against Aedes aegypti (Diptera: Culicidae), vector of dengue.
A new ultralow volume formulation (ULV) containing permethrin as an adulticidal active ingredient and the insect growth regulator (IGR) pyriproxyfen as a larvicide was developed and its efficacy evaluated in a field trial in Wanda, Misiones (Argentina). Two separate study areas were sprayed: one with a ULV formulation of permethrin 15% plus pyriproxyfen 3% and the other with permethrin 15% only. A third untreated area was kept as a control. Sentinel cages containing adult mosquitoes and jars containing Aedes aegypti larvae III/IV were placed in treated and control areas. The residual activity of the formulations was tested using 20 L water containers. The adulticide effect of permethrin 15% + pyriproxyfen 3% formulation was similar to the permethrin 15% formulation, however, the inhibition of adult emergence in the treatment with permethrin 15% never exceeded 20%, whereas the inhibition of adult emergence in the treatment with permethrin 15% plus pyriproxyfen 3% showed initial values of 96% maintaining this high level of inhibition up to 35 days after ULV spraying. Larval indexes (House and Breteau indexes) showed that a greater, long-lasting effect was obtained with the permethrin 15% plus pyriproxyfen 3% formulation.
Lucia
Alejandro
A
Centro de Investigaciones de Plagas e Insecticidas CITEFA-CONICET, Juan Bautista de La Salle 4397, Villa Martelli, Buenos Aires, (1603), Argentina. cipein@citefa.gov.ar
Harburguer
Laura
L
Licastro
Susana
S
Zerba
Eduardo
E
Masuh
Hector
H
D000330:Aedes / Q000187:drug effects*; D000818:Animals; D001118:Argentina; D004199:Disease Vectors; D004347:Drug Interactions; D007306:Insecticides / Q000008:administration & dosage / Q000494:pharmacology*; D007814:Larva / Q000187:drug effects; D026023:Permethrin / Q000008:administration & dosage / Q000494:pharmacology*; D011725:Pyridines / Q000008:administration & dosage / Q000494:pharmacology*
D007306:Insecticides; D011725:Pyridines; C055613:pyriproxyfen; D026023:Permethrin