Winter intervention against Aedes aegypti (Diptera : Culicidae) larvae in subterranean habitats slows surface recolonization in summer

Kay, B. H., Ryan, P. A., Lyons, S. A., Foley, P. N., Pandeya, N. and Purdie, D. (2002) Winter intervention against Aedes aegypti (Diptera : Culicidae) larvae in subterranean habitats slows surface recolonization in summer. Journal of Medical Entomology, 39 2: 356-361. doi:10.1603/0022-2585-39.2.356

Author Kay, B. H.
Ryan, P. A.
Lyons, S. A.
Foley, P. N.
Pandeya, N.
Purdie, D.
Title Winter intervention against Aedes aegypti (Diptera : Culicidae) larvae in subterranean habitats slows surface recolonization in summer
Journal name Journal of Medical Entomology   Check publisher's open access policy
ISSN 0022-2585
Publication date 2002
Sub-type Article (original research)
DOI 10.1603/0022-2585-39.2.356
Volume 39
Issue 2
Start page 356
End page 361
Total pages 6
Editor D. D. Steelman
W. K. Reisen
Place of publication United States
Publisher Entomological Society of America
Collection year 2002
Language eng
Subject C1
321206 Preventive Medicine
730213 Preventive medicine
Abstract At semiarid Charters Towers, north Queensland, Australia, the importance of Aedes aegypti (L.) in wells was assessed in relation to the colonization of surface habitats during the wet season. From April to July 1999, 10 wells (five positive for Ae. aegypti) were monitored to assess their status and larvae population numbers therein. All surface containers located within a 100 m radius of each well were removed, treated with s-methoprene or sealed to prevent the utilization of these containers by mosquitoes. These inner cores were surrounded by outer zones for a further 100 m in which surface containers were left untreated but all subterranean habitats were treated. Ovitraps were monitored monthly in the inner cores for 36 wk from August 1999 to April 2000 and differences in the proportions of ovitraps positive for Ae. aegypti and Ochlerotatus notoscriptus (Skuse) were analyzed by logistic regression. Analysis of the proportions of ovitraps positive for Ae. aegypti near positive wells indicated significantly greater colonization from November to March (the wet season), compared with those situated near Ae. aegypti negative wells. As Oc. notoscriptus were not produced from subterranean sites, comparisons of the proportions of ovitraps positive for Oc. notoscriptus in positive and negative inner cores provided an indication of the relative productivity of the uncontrolled surface containers in the outer zones. Differences in the utililization of ovitraps by Oc. notoscriptus among positive and negative cores were observed during only one month (March), when oviposition was greater in ovitraps in the negative cores, compared with the positive cores. Best subsets linear regression analysis of the proportion of ovitraps positive for Ae. aegypti against meteorological variables (rainfall, mean wind speed, mean relative humidity, mean minimum, and maximum temperature) during the week of ovitrapping indicated that minimum temperature and wind speed accounted for 63.4% of the variability. This study confirms that for semiarid towns such as Charters Towers, the practice of treating a relatively small number of key subterranean habitats during winter will significantly affect Ae. aegypti recolonization of surface container habitats during summer, the period of greatest risk for dengue.
Keyword Entomology
Veterinary Sciences
Aedes Aegypti
Ochlerotatus Notoscriptus
Subterranean Habitat
Surface Habitat
North Queensland
Q-Index Code C1

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Sub-type: Article (original research)
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