Abstract
A potential mosquito control agent, xanthan gum powder, was applied to a still water surface in laboratory pans to determine its efficacy in killing Aedes atropalpus (Coquillett) pupae. The ED50 of xanthan gum was 6.18 gm/m2, and the LT50 was 14.2 min. When xanthan gum was applied at a rate of 22.47gm/m2, water depth had no effect on the level of pupal mortality. The xanthan surface layer prevented access by the pupae to the air-water interface. The layer did not significantly decrease the levels of dissolved oxygen in the test pans.
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