The answer to 'when to treat for wasp' is that the best time to treat for wasps is during the spring and summer months, when wasp activity is at its peak. Wasps are most active from late spring through early fall, with the peak season typically occurring in the mid-to-late summer. This is when wasps are building their nests, foraging for food, and defending their territory.
To effectively treat for wasps, it's important to identify and locate the nest, then use an appropriate insecticide or other treatment method to eliminate the colony. Treating early in the season, before the nest becomes fully established, is generally more effective than waiting until the peak of summer when the nest is larger and the wasps are more aggressive.