Pha. Vanessen et al., DIFFERENTIAL RESPONSES OF AEDES AND CULEX MOSQUITOS TO OCTENOL OR LIGHT IN COMBINATION WITH CARBON-DIOXIDE IN QUEENSLAND, AUSTRALIA, Medical and veterinary entomology, 8(1), 1994, pp. 63-67
Field studies were conducted with EVS (encephalitis vector surveillanc
e) traps in south-eastern Queensland, Australia, to determine the rela
tive response rates of mosquitoes to three levels (0.1, 4.5 and 30 mg/
h) of 1-octen-3-ol (octenol) in combination with a standard bait of 22
00g carbon dioxide (CO2), compared with CO2 alone or CO2 with light fr
om a 6V incandescent bulb. Compared to CO2 alone, Aedes vigilax collec
tions increased significantly when CO2 was supplemented by all three o
ctenol emission levels, but not by the addition of light. Furthermore,
the 4.5 and 30 mg/h release rate of octenol gave a significant increa
se in numbers of Ae. vigilax relative to that from CO2 + light. In con
trast, collections of Culex annulirostris and Culex sitiens were not e
nhanced significantly by either the addition of light or octenol at al
l three levels. Fewer Cx sitiens were collected with octenol released
at 4.5 mg/h in comparison to CO2 alone. These differential sampling ra
tes should be taken into account when using EVS traps.