St. Paul's Seasonal Barrier Treatment Team

Residual barrier typically holds about three weeks before new activity requires re-treatment.

Both — barrier spray handles adults while larvicide treats standing water we can't drain. A single missed water source nearby can shorten how long a barrier treatment stays effective, so we always ask about the whole surrounding area, not just the yard itself.

Barrier product follows label guidelines for residential use — we'll note anything needing special handling.

Event treatment is common; we time application to peak effectiveness for your date.

Ponds usually need larvicide rather than barrier spray, since spray doesn't reach larvae developing in water. We can also advise on simple landscaping changes — trimming dense shrubs, thinning standing vegetation — that reduce resting habitat between visits.

A three-week cycle is typical, though heavier rain sometimes calls for tighter scheduling. It also helps to check for new containers holding water after storms, since a single overturned bucket restarts breeding fast.