Most pest control companies won't tell you how they choose what to put on your property, because for a lot of them the honest answer is "the same thing we put on every property." Ours is a sequence your technician works through on every visit, in order, before anything comes off the truck.
Here it is.
Species-level identification comes first, because everything downstream depends on it. Asian tiger mosquitoes and northern house mosquitoes breed in different water and bite at different times of day. Blacklegged, lone star, and American dog ticks occupy different parts of the same yard. A property with a tick problem and a property with a mosquito problem get treated differently, and most properties have both, in different places.
For mosquitoes, that means finding standing water. The corrugated drain extension, the tarp over the patio furniture, the saucer under the potted hydrangea, the clogged gutter over the deck. Four inches is enough. For ticks, it means the wooded edge, the leaf litter, the transition zone where your lawn meets whatever isn't lawn. Your technician walks the full property, not the perimeter, because you cannot treat what you have not found.
This is where a targeted treatment separates from a blanket spray. Zones where nothing is living or breeding do not get treated. Applying product to open lawn where the pest pressure isn't does nothing for you, costs money, and puts material into the ground for no reason. The map of what gets treated is different on every property, and it changes across the season as conditions change.
This decision isn't ours. We offer two treatments, we explain the difference, and we price both before we start. The honest trade-off: plant-based treatments generally need to be reapplied more often. Neither option is described here as safe, gentle, or safer than the other. That's a claim we're not permitted to make and wouldn't make anyway. What we will do is tell you exactly what each one is so you can decide for yourself.
Long Island sits on a federally designated sole-source aquifer. The water under your lawn is the water in your tap, and Suffolk County's restrictions on what can go into the ground are among the strictest in the country. Product selection in Suffolk is not automatically the same as product selection in Nassau. We're licensed under those rules, which is part of why the answer to "what are you spraying" is genuinely different from one property to the next.
Product needs roughly 30 minutes to bond to foliage. Light rain after that window won't affect the treatment. Heavy rain inside the first hour will, and when that happens we come back and re-treat at no charge. You don't have to call and ask. A treatment applied into the wrong conditions is a treatment you paid for twice.
April through October is monthly mosquito and tick barrier work across the property. October into November, and again March into April, the focus shifts to adult blacklegged ticks along wooded edges and leaf-litter zones. The two windows when adult deer ticks peak and most mosquito-only programs have already shut down for the year. The same property gets a different treatment in November than it gets in July.
This page describes how the decision gets made. The specific answer for your property gets given to you directly, on site, by the person making it:
We don't publish a single product list on this page, because there isn't one. The product depends on the species, the zone, the season, the county, and which treatment you chose. What doesn't change is that you're told what it is, every time, before it goes down.
Ask any pest control company on Long Island to walk you through their version of these seven decisions. Ask what they do differently in Suffolk than in Nassau. Ask which zones they leave untreated and why. The companies that have real answers are the ones worth hiring, and the ones that don't will change the subject to how long they've been in business.