Mosquito Dunks for Ponds & Birdbaths | Gardener's Supply
Stop Mosquitoes from Breeding in Your Birdbath or Pond! Any standing water can breed swarms of mosquitoes, even your birdbath or rain barrel. Our Mosquito Control Rings contain Bt israelensis, a naturally occurring bacterium that kills mosquito larvae for a full 30 days. Each slow-release, floating Control Ring treats 100 square feet of surface area in your pond or water garden. Control mosquitoes naturally Rings last for a month Each ring treats 100 square feet
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