BIONOMICS OF ANOPHELES IN GRIK, HULU PERAK AND INSECTICIDE SUSCEPTIBILITY OF TWO ANOPHELES SPECIES FROM TWO LOCATIONS IN MALAYSIA
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Date
2008-06
Authors
HO, LAI YEE
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Abstract
A study was conducted in the rural village of Kampung Bongor, Grik in the north
eastern part of Hulu Perak, Malaysia to examine the bionomics of the population of
Anopheles sp. in that locality. The mosquito collection was done using CBT (cow
baited trap) method. A total of 4,497 Anopheles mosquitoes were caught during the
14 months col~ection period from January 2005 to February 2006 and 11 species
were identifie'd. They were An. barbirostris, An. umbrosus, An. nigerrimus and An.
separatus from the Anopheles (Cellia) subgenus group, and An. aconitus, An.
maculatus, An. philippinensis, An. vagus, An. kochi, An. tessel/atus and An. subpictus
from the Anopheles (Anopheles) subgenus group. The seasonal distribution of most
of the population of Anopheles sp. mosquitoes is, partly influenced by the rainfall
pattern. The distribution is generally higher during heavy rainfall and lower during
the drier months. However, environmental and geographical changes also affect the
distribution pattern. Generally the biting rhythm begins after sunset and its activities
decrease before sunrise with the peak of activity occurring around midnight. A
survey was also carried out in Kampung Tepin, Balai Ringin, in the Serian district in
Sarawak to look at the population of Anopheles mosquitoes available during the
month of February 2006. The HBT (human baited trap) method by human landingbiting
catches was used for the collection of mosquitoes in this locality. During the
whole collection period, a total of 2,654 An. letifer were caught. Generally, the biting
activity of An. letifer in Kampung Tepin begins an hour after sunset and its activities
increases rapidly in two hours time. An insecticide susceptibility test using the WHO
test kits and impregnated papers with 0.75 % permethrin was carried out on two
strains of Anopheles from two different locations in Malaysia to determine their
insecticide resistance status. Results show that An. maculatus from Kampung
Bongor, Grik recorded KTso and KT9S value of 28.09 minutes and 62.98 minutes
respectively. Anopheles letifer from Kampung Tepin, Balai Ringin recorded KTso
and KT9S value of35.09 minutes and 73.03 minutes respectively. Both An. maculatus
and An. letifer showed 100 % mortality after 24 hour holding period.
Description
Keywords
BIONOMICS , ANOPHELES