Each blue water baltimore rain barrel comes with one free bti dunk to get you started vegetable oil use 1 4 cup once a week or after each storm the vegetable oil will float on the top of the water in your rain barrel suffocating the mosquito larvae should mosquitoes lay eggs in the water. Rain barrels provide a way to irrigate your garden without requiring water from the tap because it may take some time to gather a substantial amount of water the water in the barrel is generally . Depending upon the formulation of the product you may need 1 tsp to prevent mosquito larvae on the surface of a rain barrel alternatively use one circular mosquito dunk in a rain barrel the disk will slowly disintegrate in the water over the next month and will prevent larvae from growing in the water. Dont let them ban rain barrels skip navigation how to kill mosquitos in rain barrels zika virus mosquito control larvae pesticide free trap collects thousands of larvae control . Locating larvae in rain barrels if water remains after 72 hours the rain barrel should be checked for mosquito larvae however in the early stages of development mosquito larvae are small and difficult to see as the larvae grow larger it is usually possible to spot them with the naked eye
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