Field efficacy of a new repellent, KBR 3023, against Aedes albopictus (SKUSE) and Culex quinquefasciatus (SAY) in a tropical environment.
Two new repellent formulations, KBR 3023 10% and 20% from Bayer AG, Germany, were evaluated together with DEET 10% and 20% as standard repellent formulations. Evaluation was based on two separate field studies: a daytime study (0900-1700 hr) in a forested orchard on Penang Island and a nighttime study (2100-0100 hr) in a squatter residential area on the adjacent mainland of peninsular Malaysia. Both studies were carried out by exposing humans with bare arms and legs to mosquitoes landing/biting for an eight hour period. Right arms and legs of the human baits were treated with different repellent formulations (KBR 3023 10%, 20% and DEET 10%, 20%) and the left limbs were left untreated to act as controls. The daytime study indicated that all four formulations were equally effective (P < 0.05) as repellents against the predominant Aedes albopictus with greater than 88.5% reduction in landing/biting in the first four hours and not less than 65.0% in the next four hours of the assessment period. In the night study, all four formulations were also found to be equally effective (P < 0.05) in repelling Culex quinquefasciatus, the predominant species. All four formulations provided complete protection against Cx. quinquefasciatus in the first two hours of exposure. The percentage reduction values were maintained above 90.0% for the next six hours of the assessment period. In conclusion, both the KBR 3023 and DEET formulations were found to be equally effective (P < 0.05) in providing a long-lasting reduction in human-mosquito contact in both the day and night field studies.
Vector Control Research Unit, School of Biological Sciences, Universiti Sains Malaysia, Penang, Malaysia.
H H
HH
Yap
K
K
Jahangir
A S
AS
Chong
C R
CR
Adanan
N L
NL
Chong
Y A
YA
Malik
B
B
Rohaizat
D000330:Aedes; D000818:Animals; D003465:Culex; D003671:DEET / Q000008:administration & dosage*; D006801:Humans; D007299:Insect Bites and Stings / Q000517:prevention & control*; D007300:Insect Control / Q000379:methods; D007302:Insect Repellents / Q000008:administration & dosage*
D007302:Insect Repellents; D003671:DEET