Influence of synthetic oviposition pheromone and volatiles from soakage pits and grass infusions upon oviposition site-selection of Culex mosquitoes in Tanzania

Citation
Leg. Mboera et al., Influence of synthetic oviposition pheromone and volatiles from soakage pits and grass infusions upon oviposition site-selection of Culex mosquitoes in Tanzania, J CHEM ECOL, 25(8), 1999, pp. 1855-1865
Citations number
31
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF CHEMICAL ECOLOGY
ISSN journal
0098-0331 → ACNP
Volume
25
Issue
8
Year of publication
1999
Pages
1855 - 1865
Database
ISI
SICI code
0098-0331(199908)25:8<1855:IOSOPA>2.0.ZU;2-A
Abstract
The response of Culex mosquitoes to (5R,6S)-6-acetoxy-5-hexadecanolide (the synthetic oviposition pheromone, SOP), emanations from soakage pit water ( SPW), and grass infusions (GI) was studied in pit latrines in Muheza, Tanza nia. Water treated with the synthetic oviposition pheromone received more e gg rafts of Cuter quinquefasciatus Say and Cx. cinereus Theobald than did t he untreated water (P < 0.001). The residual activity of SOP did not decrea se over a nine-day period, with the geometric mean number of egg rafts laid in the SOP-treated water varying daily between 2.5 and 8.9 as compared to 0.1-1.6 egg rafts laid in tap water. However, SOP did not attract ovipositi ng mosquitoes to nonbreeding sites, and both treatment and control received few eggs. SPW and GI attracted ovipositing Cx. quinquefasciatus, Cx. ciner eus, and Cx. tigripes Grandpre and de Charmoy with the number of eggs rafts deposited in bowls containing SPW or GI being larger than that deposited i n bowls with tap water (P < 0.05). More egg rafts of Cx. quinquefasciatus w ere deposited in SOP-treated water than in SPW (P < 0.05). When SOP was com pared with SOP + SPW, more egg rafts of Cx. quinquefasciatus were deposited in bowls with the latter combination than in bowls containing SOP or SPW o nly (P < 0.05), indicating a synergistic effect between SOP and SPW Similar ly, when SOP-treated water and GI were compared with SOP + GI, more egg raf ts of Cx. quinquefasciatus were laid in the latter bowl, indicating a syner gistic effect between SOP(-)and GI. The results suggest that the combined u se of SOP and organically enriched water can be employed in monitoring of C x. quinquefasciatus for control programs. This is the first record of the a ttraction of Cx. cinereus and Cx. tigripes to oviposition stimuli.