We have a 23′ trailer that is parked in a camp on the edge of a forest. We have had it for two years. Last year we started noticing the large black ants inside the trailer, on the floor, the odd one in the cupboards, maybe a dozen or so would be there when we got there on the weekend. I have put out ant dust and ant poison but there are still more the following weekend. There are none in the attached Florida room. This summer we are seeing fine white powder/tiny granules coming from the ceiling vents and when my husband turned on the air conditioner this past weekend it was like a snowstorm. Do you have any suggestions for us? Carpenter ants are known to be prevalent in the park. Thank you.

My first suggestion is that you read our CARPENTER ANT CONTROL ARTICLE. This in depth reading will cover all you need to know if you want to get rid of these destructive ants. In the article you’ll find links to the products that can be used to solve the problem but I can tell right away that your situation will require a combination of bait and spray. And not just any bait or spray but two that are unique in that they take a long time to work. This insures they’ll get “worked” into all the local nests so once the active ingredient starts to work, the colonies will be destroyed because they won’t know what hit them.

As our article explains, carpenter ants chew through wood for making nests. One of the results of this chewing will be sawdust and it sounds like you’re seeing enough of that to substantiate a large nest. But are you seeing any ants trailing? Any place you see ants active you need to leave be and do not disturb them. I also suggest you remove the dust and “poison” you’ve set out as both will do nothing more than spook these guys which will effectively make it harder to control them. Knowing where they’re active and leaving them alone will insure you can use the workers to “bring back the poison” you’re about to set out.

Now once the old products you applied have been removed, you should set out some CARPENTER ANT GEL anywhere inside where you see them active. This slow acting bait will be readily accepted and shared with other colony members which ultimately means the death of these nests. It uses “honey dew” as the main attractant and this is something these guys need to feed their young so they’ll greedily consume any you place out.

Next you should treat the outside with PHANTOM CONCENTRATE. Spray the foundation, under the trailer and basically anyplace you either see activity or suspect they might be active. Like the Gel, this active is slow acting and won’t spook or affect any of them for several days. But by walking over the treated surfaces they’ll unknowingly be bringing some back to their nests which in turn will mean their demise.

Lastly, be sure to spray periodically around the trailer to insure they don’t come back. Carpenter ants are persistent and strong. And as our article explains, they’ll commonly have several nests all interconnected so it’s important that you keep a regular maintenance program in place to prevent re-infestations. And FYI, our article explains that finding the nest is usually quite important but in some cases that’s hard to do. I suspect you have one of these situation so the products I recommended are ideal for when you can’t locate the colony and made for the job.

Here are direct links to the information and products listed above:

Carpenter Ant Control:  https://www.carpenterants.com/carpenter-ant-control

Carpenter Ant Gel:  http://www.bugspraycart.com/bait/gel/maxforce-carpenter-ant-gel-1-oz

Phantom Concentrate:  http://www.bugspraycart.com/insecticide/liquid/phantom-21-oz