Effectiveness of using of human metabolic compounds to trap Aedes albopictus
Author of the article:WU Hua;DAI Jian-Qing;CHEN Da-Song;HUANG Hong;ZHENG Ji-Huan
Author's Workplace:Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Science, Guangzhou 510260, China;Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Science, Guangzhou 510260, China;Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Science, Guangzhou 510260, China;Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Science, Guangzhou 510260, China;Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Science, Guangzhou 510260, China
Key Words:human metabolic compounds; mosquito control; trap trapping; Aedes albopictus; synergism
Abstract:
[Objectives] To evaluate the effects of eight human
metabolic compounds on the oviposition of female Aedes albopictus mosquitoes, and their effectiveness as lures for
trapping this species in the field. [Methods] The mosquito traps and
mosquito-ovitraps were used to determine the relative attractiveness of the
metabolic compounds tested and mosquito density, respectively. [Results] Among the eight compounds tested, acetic
acid, propionic acid, and octanoic acid were all significantly more attractive
than the control. The mean accumulated egg number laid by Ae.albopictus in ovitraps baited with acetic acid (1, 10, 100, 1
000 µL/L), propionic acid (1, 10, 100, 1 000, 10 000 µL/L), and octoic acid (1,
10, 100, 1 000 µL/L), solutions were more than laid in ovitraps baited with the
distilled water control. Among these treatments, ovitraps containing 100 µL/L
acetic acid, propionic acid, and octanoic acid water solutions had
significantly higher egg numbers than those with distilled water.However, the mean accumulated egg number of traps baited with different
concentrations of L-lactic acid, 1-octene-3 alcohol, ethyl acetate, ammonia,
and a urea water solution, were not significantly different to that of the
distilled water control. The accumulated number of eggs laid, and the number of Ae.albopictus females attracted by a
1∶1∶1 ratio of acetic acid∶propionic acid∶octanoic acid at the same concentration (100 µL/L) were significantly
higher than those attracted to either acetic acid, propionic acid, octanoic
acid, or distilled water alone. This demonstrates that acetic acid, propionic
acid, and octanoic acid have a synergistic effect. Analysis of a year of
trapping data indicate that the mosquito density index and number of eggs
deposited in ovitraps decreased significantly in the most active month of the
year during which there was no significant difference in the number of
mosquitoes trapped and the oviposition index between the treatment and control
groups. However, the mosquito oviposition index significantly declined in May,
June and October, particularly at sites where it had been low before trapping
began. [Conclusion] Continuous
trapping can significantly reduce the mosquito density and egg density indices,
and these effects are more pronounced in areas with a low trapping indices.
This method of mosquito control provides effective continuous control of Ae. albopictus and should be more widely
used.