Spring is the best time to treat before you have them crawling across your counter. Carpenter ants are the largest in size and do the most damage to your house. Unexplained piles of sawdust may indicate a nearby infestation and should not be ignored. Carpenter ants also attack trees in your yard. With our new treatment, only one treatment is needed which will knock out the whole nest and continue to protect your home for the rest of the year.