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Published on: November 9, 2015
Physical influence on larvicidal and pupicidal activity of the silicone-based monomolecular film
Warunee Ngrenngarmlert1, Chutipong Sukkanon1, Rapeeporn Yaicharoen1
1Department of Community Medical Technology, Faculty of Medical Technology, Mahidol University, Nakhon Pathom 73170, Thailand.
Abstract:
Although silicone-based monomolecular film (MMF) has been accepted as larvicide in several countries, its mosquito control potential has never been investigated in Thailand. Laboratory assessment in this study was conducted to determine the MMF efficacy against Aedes aegypti. At the recommended dosage (1mL/m(2) of water surface), mortality of pupae (99.17±0.83%) was significantly greater than mortality of old and young larvae (73.33±9.13, 11.67±3.47%; respectively). Pupicidal activity was rapidly exhibited within hours while larvicidal activity took at least one day. Interestingly, among the survived mosquitoes after MMF exposure, larval length (3.6±0.18mm), pupation (0%) and adult emergence (0%) were significantly less than the control group. Gravid females also avoided laying eggs in MMF-treated oviposition cups. There was no influence of physical factors on MMF efficacy and no toxic effects on fish and plants. These results indicated the MMF is promising to provide not only larvicidal and pupicidal activity but also inhibition of larval development as indicated by both larval length and stage transformation.
Insights
Silicone-based monomolecular film (MMF) shows high efficacy in controlling Aedes aegypti mosquitoes in Thailand. This larvicide effectively kills pupae and larvae, and inhibits development and egg-laying.
Area of Science:
- Environmental Science
- Medical Entomology
- Vector Control
Background:
- Silicone-based monomolecular film (MMF) is an established larvicide globally.
- Its efficacy against mosquitoes in Thailand remains uninvestigated.
- Aedes aegypti is a significant vector of diseases in Thailand.
Purpose of the Study:
- To evaluate the mosquito control potential of MMF in Thailand.
- To assess MMF efficacy against Aedes aegypti larvae and pupae.
- To determine MMF effects on mosquito development and oviposition.
Main Methods:
- Laboratory assessment of MMF against Aedes aegypti.
- Testing MMF at a recommended dosage of 1mL/m² of water surface.
- Evaluating larvicidal, pupicidal, developmental, and oviposition inhibition effects.
Main Results:
- MMF demonstrated high pupicidal (99.17%) and larvicidal (73.33%) activity.
- Pupicidal action was rapid (hours), while larvicidal action took longer (days).
- MMF significantly reduced larval length, pupation, and adult emergence, and inhibited gravid female egg-laying.
Conclusions:
- MMF is a promising agent for Aedes aegypti control in Thailand.
- It exhibits larvicidal, pupicidal, and developmental inhibitory properties.
- MMF poses no threat to fish or plants and is unaffected by physical factors.
