Beneficial nematodes....make sure they are fresh. I think you mix them with water and spray over the lawn and they eat the flea eggs.
I've never used it but I hear the Natural Gardener show recommend them all of the time.
ETA:
This is a quote from The Natural Gardener website:
"Beneficial Nematodes
These are a microscopic organism that eat the larvae of the fire ant (also fleas and grubs!) They can be used anywhere that gets supplemental water in the summer - no fields or natural areas. We offer bags that cover 8,000 square feet or 15,000 square feet. It is usually applied with a hose end sprayer and must be kept cool, i.e. in the refrigerator until you are ready to use it."
I've never used it but I hear the Natural Gardener show recommend them all of the time.
ETA:
This is a quote from The Natural Gardener website:
"Beneficial Nematodes
These are a microscopic organism that eat the larvae of the fire ant (also fleas and grubs!) They can be used anywhere that gets supplemental water in the summer - no fields or natural areas. We offer bags that cover 8,000 square feet or 15,000 square feet. It is usually applied with a hose end sprayer and must be kept cool, i.e. in the refrigerator until you are ready to use it."
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