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.
Description
Master
Keywords
Biological Science , Mosquitoes