COMPARATIVE LABORATORY ACTIVITY AND SEMI-FIELD EFFICACY OF OMNIPRENE® G AND ALTOSID® PELLETS AGAINST AEDES AEGYPTI

Area of Science:

• Entomology and Vector Control
• Environmental Science and Public Health

Background:

• Biorational larvicides are essential for mosquito and mosquito-borne disease management, but effective, safe, and quality options are limited.
• Conventional pesticides face increasing restrictions, driving the need for innovative formulations of existing active ingredients, including insect growth regulators.

Purpose of the Study:

• To compare the laboratory activity and semi-field efficacy of OmniPrene G and Altosid Pellets with DR-tech, both containing 4.25% S-methoprene.
• To evaluate the performance of these larvicides against the yellow fever mosquito, Aedes aegypti, at different application rates (2.8 kg/ha and 11.2 kg/ha).

Main Methods:

• Laboratory bioassays were conducted to assess the efficacy of both products against Aedes aegypti.
• Semi-field studies in outdoor microcosms compared the performance of OmniPrene G and Altosid Pellets at two different dosages over nine weeks.

Main Results:

• Both products demonstrated comparable inhibition of emergence in laboratory bioassays.
• In semi-field trials, OmniPrene G showed faster initial efficacy at lower doses, while Altosid Pellets exhibited higher efficacy in later weeks.
• Higher application rates (11.2 kg/ha) resulted in more uniform efficacy for both products, with similar mortality patterns primarily occurring before adult emergence.

Conclusions:

• OmniPrene G offers comparable efficacy to Altosid Pellets against Aedes aegypti.
• OmniPrene G provides advantages such as faster initial active ingredient release and more even coverage, especially at lower application rates.