ISCEP 2026 At Sunway Putra Hotel 17-18 August 2026
ABSTRACT
ORAL PRESENTATION ABSTRACT
T3.02
EFFECTIVENESS OF A COMMERCIAL ORGANOPHOSPHATE TEMEPHOS AGAINST AEDES ALBOPICTUS LARVAE FROM RESIDENTIAL SITES IN PENINSULAR MALAYSIA
Noor Izuddin NUREEN-AFRINA', Navindra Kumari PALANISAMY¹², Saffiee NUR-SAFWANAH", Asri LAILATUL-NADHIRAH', Isa Mohamad RODI, Shamshul Anuar INTAN-UMAIRATH', Nizam NABIHA", Saifulazmi NUR-FADLIN', Wan Nor Saidah AZLAN, Mohd Nasir NADZIMAH, Othman WAN-NORAFIKAH**
'Faculty of Medicine, Univar Teknologi MARA (UTM) Selangor Branch, Sungai Buloh Campur, Sungai Buloh Selangor, Malayzia
HW Real Live Faculty of Applied Sciences, Uni Faculty of Pharmacy that Teknologi MARA (LATA, Shah Alam, Selangor, Malaya arst Takealogi MARA (LTM Pabang Branch, Jengka Campus Bandar Tan Abdul Razak langka, Pahang, Malayala knabg MARA ATM Selangor Bunch, Puncak Alam Campus Bandar Puncak Alam, Sala horaich@utnedumy
Despite countless control efforts by authorized health bodies and the public. dengue cases in Malaysia main alarming. Dengue vector control relies mainly on insecticides, such as organophosphates, to target mosquito larvae and adults. However, their continuous use may initiate resistance in dengue vectors, namely Aedes aegypt and Aedes albopictus. This study evaluated the effectiveness of a commercial organophosphate temephos in inducing mortality in Ae. albopictus larvae from three dengue-risk and three dengue-free residential sites in Peninsular Malaysia. Water replenishment and non-replenishment tests were conducted under laboratory conditions by exposing field populations and a laboratory reference strain of third instar Ae. albopictus larvae to temephos in plastic containers at the recommended operational dosage of 1 mg L-1 for 40 weeks. Results demonstrate that over 30.00% larval mortality was achieved during the first four weeks of exposure across all tested populations. Mortality decreased to 80.00% -90.00% between weeks five and 11, 50.00% - 60.00% between weeks 12 and 12 and below 20.00% by weeks 34 to 40. These findings indicate that temephos remains effective in exterminating Ae. albopictus larvae across all residential sites for about four to six months, even with weekly water replenishment and regardless of their prior exposure to public health insecticides Nevertheless, routine monitoring of mosquito susceptibility is important to ensure the continued relevance of insecticide use particularly temephos, while mitigating resistance risks and sustaining the effectiveness of dengue control strategies.
Keywords: Asles actus organophosphate, terephos, residential sites, water replenishment, Maleysi
INTERNATIONAL SCIENTIFIC CONFERENCE ON ENTOMOLOGY AND PEST SCEP) 2006