A pesticidal formulation for treatment of water to control water borne pests such as mosquitoes and blackfly or water hyacynth comprises tablets, granules or the like containing in their interior one or more pesticidal ingredients together with one or more effervescence-initiation components and a surface active dispersant so formulated that, when added to the water to be treated, they are capable of dispersing the pesticidal ingredients at or near the surface of the water.
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