A biodegradable lethal ovitrap for control of container-breeding Aedes.

Area of Science:

• Vector control
• Environmental science
• Materials science

Background:

• Lethal ovitraps (LO) are used for dengue control but require retrieval, which is labor-intensive.
• Current LO retrieval involves data logging, locating, and examining traps, reducing operational efficiency.

Purpose of the Study:

• To develop and evaluate a biodegradable lethal ovitrap (BLO) that eliminates the need for retrieval.
• To assess the efficacy of BLOs in controlling container-breeding Aedes mosquitoes, specifically Aedes aegypti.

Main Methods:

• BLOs were manufactured using injection molding with thermoplastic starch (TPS) polymer blends.
• Field trials assessed Aedes aegypti oviposition in BLOs compared to standard plastic LO.
• Biodegradability was tested using an accelerated composting trial (ISO16929:2002E).

Main Results:

• Aedes aegypti readily oviposited in BLOs, with black-dyed traps preferred.
• Water loss was higher in BLOs, but they remained functional for 5 weeks.
• Oviposition rates in BLOs were comparable to standard LO.
• BLOs fragmented within 4 weeks and were not visible after 12 weeks in composting trials.

Conclusions:

• Biodegradable lethal ovitraps offer a viable, low-logistical alternative for Aedes aegypti control.
• BLOs can be deployed in a "set it and forget it" strategy to reduce dengue transmission.
• The material's biodegradability aligns with environmental sustainability goals in pest control.