Spray in the early morning or late afternoon when the ants are most active. And it's best to spray on a calm day to prevent drift. If ants are still building mounds after six weeks, treat the lawn again (the insecticide works for up to six weeks).

What time of year do you treat ants?

For the most effective and economical control, use baits only when there is an ant problem. Treatments made in late winter and early spring when ant populations are just beginning to grow will be most effective.

How do I get rid of ants permanently?

If you see ants, wipe them up with a solution of 50-50 vinegar and water, or straight vinegar. White vinegar kills ants and also repels them. If you have an ant problem, try using diluted vinegar to clean hard surfaces, including floors and countertops, throughout your home.