Studies on the mosquito fauna in an urban and suburban area in penang and the laboratory efficacy of mosquito coils containing different active ingredients against selected vector

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Date
2007
Authors
Rozilawati, Harun
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Abstract
A study of the mosquito fauna in an urban and suburban area in Penang Island was carried out for 14 months namely in; Taman Permai Indah (on the island) and Kg Pasir Gebu (mainland). Using the cow baited trap and bare leg catch techniques, it was found that Culex gelidus totalling 675 (22.80%) was the most abundant in Kg Pasir Gebu followed by 514 (17.37%) Anopheles peditaeniatus , 383 (12.94%) Anopheles sinensis, 254 (8.58%) Mansonia uniformis, 252 (8.52%) Anopheles subpictus, 192 (6.49%) Anopheles campestris and 135 (4.57%) Anopheles vagus. The mosquitoes were more attracted to cow than human. Outdoor ovitrap surveys were also carried out in the urban and suburban sites and it was found that Aedes albopictus was the most abundant Aedes species in this area, even though a small percentage of Aedes aegypti and Culex quinquefasciatus was found to breed simultaneously in the same ovitrap. This indicated that the main dengue vector is Aedes albopictus. A strong correlation was found between rainfall and number of eggs in both of the study sites(r=0.982 and r=0.918). The eggs collected were more abundant during low rainfall (dry season) than during higher rainfall (wet season). The ratio between males and females that emerged from the eggs collected was also close to one (TPI=0.93+ 0.33 and KPG=0.97+0.42). The effectiveness of five selected mosquito coil formulations was also studied against four selected vector mosquitoes (Aedes aegypti, Aedes albopictus, Culex quinquefasciatus and Anopheles sinensis). Anopheles sinensis was the most susceptible against all the formulation, whereas Culex quinquefasciatus was found to be the most tolerant species against all the formulation based on the KT50, KT95 and mortality values. The laboratory strain mosquitoes were also more susceptible than the field strain.
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Master
Keywords
Biological Science , Mosquitoes
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