Unveiling the insights of controlling invasive <i>Aedes</i> mosquitoes in simulated urban catch basins by Sumilarv 0.5G Sachet containing pyriproxyfen

Aedes aegypti (L.) and Aedes albopictus (Skuse) are significant urban pests and disease vectors. In addition to small containers, the urban storm drains serve as an extensive production ground. Management of these species is notoriously challenging due to numerous reasons, such as lack of optimal larvicide products. A larvicide, Sumilarv 0.5G Sachet, containing 0.5% pyriproxyfen, a juvenile hormone analog (JHA), was evaluated for its bioactivity and efficacy in simulated storm drain catch basins. In bioassays, high bioactivity in inhibition of emergence (IE) was observed with no significant differences between test materials or species. Against Ae. aegypti, the IE10, IE50 and IE90, respectively, measured 0.011, 0.028, and 0.122 ppb for the technical grade, and 0.016, 0.036, and 0.161 ppb for the formulated granules from the sachet. A similar bioactivity was observed in Ae. albopictus. The IE10, IE50, and IE90, respectively, amounted 0.013, 0.033, and 0.142 ppb for the technical grade, and 0.015, 0.038, and 0.151 ppb for the formulated product. In simulated storm drain catch basins, application of Sumilarv 0.5G Sachet at three sachets (25 g each) per 151.4 L of water provided sustained control of Ae. aegypti (91.1% to 100%) and Ae. albopictus (91.0% and 100%) for up to 22 wk, despite poor water quality and low detectable pyriproxyfen concentrations. These results demonstrate that Sumilarv 0.5G Sachet is a highly effective and reliable larvicide for long-term control of invasive Aedes mosquitoes in urban storm drain systems.