Marion Center's Seasonal Barrier Treatment Team

Most treatments stay effective around 21 days, which is why seasonal programs schedule on that cycle.

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. A few landscaping adjustments between visits can meaningfully extend how long a barrier treatment stays effective.

A three-week cycle is typical, though heavier rain sometimes calls for tighter scheduling. We recommend a yard check after heavy rain, since new standing water shows up in unexpected places.