As explained in our CARPENTER ANT CONTROL article, these ants do nothing but forage around all day looking for food and working on their nests. I suggest you read the article which will provide a lot of insight to this ant as well as some practical things you can do to minimize this activity. I do suspect there is a nest either on the home or close by based on how much activity you said you see. But I have seen where they could be this active and still be living off the property.

As you'll learn in our article, there is usually a few things needed to control most infestations. That being said, your activity can best be controlled by baiting and spraying. Apply some MAXFORCE GRANULES to the yard which should cut down on the foraging. Next, spray the foundation with the TERMIDOR CONCENTRATE. This will provide much needed protection in case they are currently accessing the home in some location you cannot see. The way Termidor works, you'll be able to effectively control any nest on or in the home whether you know where it exists or not.

As explained in our CARPENTER ANT CONTROL ARTICLE, most all carpenter ant nests are networked to the surrounding environment. This insures their survival and why it's imperative that all the "satellite" nests in any one network are either directly treated or baited to insure quick and complete control when treating for carpenter ants around your property.

Based on the limited information you provided, it sounds as though there are either stragglers or scout workers coming from missed nests that were part of the original network. If the activity is from stragglers, chances are high they'll die off in a few days and disappear. And though you mention the CYPERMETHRIN and DRIONE DUST being applied, I don't see any mention of bait like our MAXFORCE GRANULES or CARPENTER ANT GRANULES. Either of these should be used around the property to insure complete eradication so that if there is a local network nest in the area, it won't be able to survive. Ants from that nest would undoubtedly forage toward the house as they have been doing in the past except that this time they would find the bait you have applied and die after some was ingested. That's not to say the Cypermethrin won't help control these foraging ants because many times it will. However, networked nests are slow to give up old habits and many times will keep trying and trying to find their old nests till they find their way back through an area where maybe the spray isn't strong enough anymore. Once inside the barrier, they'll attempt to start a new nest.

So in summary, I would say a Bait application outside the spray you've applied would be wise to do. If not, you'll need to keep a close watch on the area to make sure the few ants you're seeing don't start a new nest or worse yet, that they are part of a nest you've missed. Leaving an active nest close to the home is a sure receipe for reinfestation.

Carpenter ants can be a real problem once they nest on or in your home. I'm not sure you have a nest in your house just yet and hopefully you don't. Since carpenter ants can cause a lot of damage, they're the one type of ant you never want nesting inside your house.

For starters, I suggest you read through our on line article about CARPENTER ANT CONTROL. There you'll find most of your questions answered about the biology and recommended treatments for this ant. Based on the information you listed above, I think a good foundation spraying with TERMIDOR will keep them out. For the ants that are foraging around in the grass, apply some CARPENTER ANT GRANULES. This food based bait they seem to love and will quickly accept your placements. Once they feed, any nests close by will die and this should insure you don't get new nests on your house.