Coffee Grounds for Mosquito Control - Fact or Fiction?

Coffee Grounds for Mosquito Control - Fact or Fiction?

Many believe coffee grounds can repel mosquitoes and act as a natural insecticide. Although no conclusive studies demonstrate coffee's efficacy in driving mosquitoes from typical yards, caffeine does have insecticidal properties. Research indicates female mosquitoes are less likely to lay eggs in water mixed with coffee grounds, and discarded grounds can kill mosquito larvae. Caffeine disrupts insects' biological processes, making it a potent natural insecticide. Studies show that water containing highly concentrated coffee extracts deters egg-laying, while used grounds decrease egg hatching by about 30%. Another experiment found used coffee grounds can kill mosquito larvae in standing water, with higher coffee concentrations proving more lethal. Despite these findings, brewing highly concentrated coffee for mosquito control isn't practical or guaranteed to work outside laboratory conditions. However, adding leftover coffee grounds to outdoor water sources may help prevent larvae from hatching. Removing stagnant water remains a more effective mosquito control strategy.

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