Your article on cluster flies fits our problem exactly. Our problem has become as bad as you describe. Please send us information on all the products we need to try and eliminate them. Thank you.
If you review our CLUSTER FLY ARTICLE, you’ll see links to all the products designed for controlling this pest. The following is a summary of what our article lists.
Basically you’ll want to spray the outside of the structure with CYPERMETHRIN in the fall when cluster flies start looking for structures on which to hibernate.
Cypermethrin: https://bugspray.com/catalog/insecticide/liquid/viper-cypermethrin
But if its already winter and you have them inside the home, you’ll want to do a few things to keep them manageable throughout this season.
First, you’ll want to apply ONSLAUGHT around window frames, moldings, sills etc. by “painting” it onto any surface where they’re active. Onslaught will last 6-12 months so one treatment will last a long time killing any that land on it. And since its odorless and dries clear, you won’t know its present once the application dries.
Onslaught: https://bugspray.com/catalog/insecticide/liquid/onslaught
Now if you suspect they are nesting in your attic or wall voids, dust these areas using DRIONE DUST.
Drione: https://bugspray.com/catalog/insecticide/dust/drione-dust
Drione lasts a year or more and when applied to voids it will kill and prevent cluster flies from nesting successfully.
Lastly, set up POWER TRAPS on any window where you see activity. These traps will do a great job of picking up any flies the treatments miss.
Powder Trap: https://bugspray.com/traps/fly/fly-powder-trap
More details on all these products and how to use them can be read in our article here:
Cluster Flies: https://bugspray.com/cluster-fly.html
Give us a call if you need more help. Our toll free is 1-800-877-7290 and we’re open 9:00 AM to 6:00 PM Mon-Thur; 9:00 AM to 4:00 PM Friday and 9:00 AM to 1:00 PM Saturday, Eastern Standard Time.
Jonathan
Customer Care
https://bugspray.com
1-800-877-7290
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