The Efficacy Of Biopesticides, Ipomoea Cairica (L.) Leaf Extracts And Metarhizium Anisopliae (Metsch.) On Resistant Populations Of Aedes Aegypti (L.) And Aedes Albopictus (Skuse) In Urban And Suburban Areas Of Penang Islands, Malaysia

Ng, Kin Hoong (2024) The Efficacy Of Biopesticides, Ipomoea Cairica (L.) Leaf Extracts And Metarhizium Anisopliae (Metsch.) On Resistant Populations Of Aedes Aegypti (L.) And Aedes Albopictus (Skuse) In Urban And Suburban Areas Of Penang Islands, Malaysia. PhD thesis, Perpustakaan Hamzah Sendut.

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Abstract

Biopesticides, derived from natural sources like plant extracts and fungi, are eco–friendly alternatives to synthetic insecticides, offering minimal environmental and human health risks while reducing resistance development. Adult bioassays revealed that urban and suburban ae. Aegypti and ae. Albopictus were resistant to four chemical insecticides (0.05% deltamethrin, 0.75% permethrin, 5% malathion, 0.25% pirimiphos–methyl), but resistance decreased with piperonyl butoxide (pbo). This study evaluated the efficacy of ipomoea cairica leaf extracts (solvent: acetone) and metarhizium anisopliae (meta–g4) in controlling insecticide–resistant aedes populations on penang island. Ipomoea cairica leaf extracts demonstrated the highest larvicidal activity against aedes aegypti urban and suburban strains, while m. Anisopliae was most effective against aedes albopictus suburban strains, with optimal mortality achieved using 500 ppm i. Cairica extract or 1×108 conidia/ml of 14–day-old m. Anisopliae. Synergistic effects were observed when 350 ppm i. Cairica was combined with 1×106 conidia/ml m. Anisopliae, achieving a robust “dual-attack” against ae. Aegypti. The compatibility of biopesticides with insecticides also enhanced efficacy against adult aedes, particularly in ae. Albopictus. Biochemical assays confirmed metabolic resistance mechanisms, with ae. Aegypti showing susceptibility but some tolerance to biopesticides, highlighting their potential in integrated resistance management.

Item Type: Thesis (PhD)
Subjects: Q Science > QH Natural history > QH1-278.5 Natural history (General)
Divisions: Pusat Pengajian Sains Kajihayat (School of Biological Sciences) > Thesis
Depositing User: Mr Hasmizar Mansor
Date Deposited: 25 Feb 2026 01:23
Last Modified: 25 Feb 2026 01:23
URI: http://eprints.usm.my/id/eprint/63652

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