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Electric nets and sticky materials for analysing oviposition behaviour of gravid malaria vectors

Dugassa, S.; Lindh, J.M.; Torr, S.J.; Oyieke, F.; Lindsay, S.W.; Fillinger, U.

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Authors

S. Dugassa

J.M. Lindh

S.J. Torr

F. Oyieke

U. Fillinger



Abstract

Background Little is known about how malaria mosquitoes locate oviposition sites in nature. Such knowledge is important to help devise monitoring and control measures that could be used to target gravid females. This study set out to develop a suite of tools that can be used to study the attraction of gravid Anopheles gambiae s.s. towards visual or olfactory cues associated with aquatic habitats. Methods Firstly, the study developed and assessed methods for using electrocuting nets to analyse the orientation of gravid females towards an aquatic habitat. Electric nets (1m high × 0.5m wide) were powered by a 12V battery via a spark box. High and low energy settings were compared for mosquito electrocution and a collection device developed to retain electrocuted mosquitoes when falling to the ground. Secondly, a range of sticky materials and a detergent were tested to quantify if and where gravid females land to lay their eggs, by treating the edge of the ponds and the water surface. A randomized complete block design was used for all experiments with 200 mosquitoes released each day. Experiments were conducted in screened semi-field systems using insectary-reared An. gambiae s.s. Data were analysed by generalized estimating equations. Results An electric net operated at the highest spark box energy of a 400 volt direct current made the net spark, creating a crackling sound, a burst of light and a burning smell. This setting caught 64% less mosquitoes than a net powered by reduced voltage output that could neither be heard nor seen (odds ratio (OR) 0.46; 95% confidence interval (CI) 0.40-0.53, p < 0.001). Three sticky boards (transparent film, glue coated black fly-screen and yellow film) were evaluated as catching devices under electric nets and the transparent and shiny black surfaces were found highly attractive (OR 41.6, 95% CI 19.8 – 87.3, p < 0.001 and OR 28.8, 95% CI 14.5 – 56.8, p < 0.001, respectively) for gravid mosquitoes to land on compared to a yellow sticky film board and therefore unsuitable as collection device under the e-nets. With a square of four e-nets around a pond combined with yellow sticky boards on average 33% (95% CI 28-38%) of mosquitoes released were collected. Sticky materials and detergent in the water worked well in collecting mosquitoes when landing on the edge of the pond or on the water surface. Over 80% of collected females were found on the water surface (mean 103, 95% CI 93–115) as compared to the edge of the artificial pond (mean 24, 95% CI 20–28). Conclusion A square of four e-nets with yellow sticky boards as a collection device can be used for quantifying the numbers of mosquitoes approaching a small oviposition site. Shiny sticky surfaces attract gravid females possibly because they are visually mistaken as aquatic habitats. These materials might be developed further as gravid traps. Anopheles gambiae s.s. primarily land on the water surface for oviposition. This behaviour can be exploited for the development of new trapping and control strategies.

Citation

Dugassa, S., Lindh, J., Torr, S., Oyieke, F., Lindsay, S., & Fillinger, U. (2012). Electric nets and sticky materials for analysing oviposition behaviour of gravid malaria vectors. Malaria Journal, 11(1), Article 374. https://doi.org/10.1186/1475-2875-11-374

Journal Article Type Article
Publication Date Nov 14, 2012
Deposit Date Jan 7, 2013
Publicly Available Date Mar 28, 2024
Journal Malaria Journal
Publisher BioMed Central
Peer Reviewed Peer Reviewed
Volume 11
Issue 1
Article Number 374
DOI https://doi.org/10.1186/1475-2875-11-374
Keywords Malaria, Anopheles gambiae, Oviposition, Electric nets, Sticky film.

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