When it gets hot, the ants start marching indoors. When it rains, in come the ants. Too cold? The ants know where its nice and cozy: your kitchen, bathroom and pet food bowls. Outdoors, pet food and garbage cans are also ant attractants. Argentine ants, those busy little black ants, are in march formation year round.
In years past, we would reach for the spray can and douse those little scavengers. But not anymore.
Many of those spray pesticides are only effective with direct contact on the ants. And the stronger sprays, with residual action to thwart the next wave of ants, is potentially harmful to you, your kids, your pets.
So, here is what we are doing now: following the recommendations of the UC Davis Integrated Pest Management Project for Ant Control.
That includes:
• Determine what the ants are attracted to and remove the food source• Vacuum trails, wipe them with soapy water, or spray with window cleaner• Locate entry points and caulk openings or plug with petroleum jelly• Put out bait stations with liquid ant bait or apply gel bait at entry points• Baits take time to work so continue to clean up trails• Indoor sprays are not usually necessary.
• Avoid products packaged as granules that contain the active ingredients cyfluthrin or permethrin. Although these products may be mistaken for baits, they are actually contact insecticides that rapidly kill foragers and do not control the colony.
Before wiping up (or wiping out) the little critters, follow their trail. Note their entry point into the house. Seal it up. We have found ants entering the house in a variety of small avenues: beneath moulding, cracks in the window frame, behind electrical outlet plates...and one of the ants’ favorite entries: that large holes beneath the sink where the pipes enter the house.
According to the UC IPM page on ant control, “If ants can be thoroughly washed away and excluded from an area, an insecticide is probably not necessary. Vacuuming up ant trails or sponging or mopping them with soapy water may be as effective as an insecticide spray in temporarily removing foraging ants in a building because it removes the ant’s scent trail, especially if thorough cleaning is done at the entry points. Some soap products such as window cleaners can kill ants on contact but leave no residual toxicity. Certain plant-based oils are also applied for this purpose, but their odor can be offensive.”
Coming Up After the Paywall
• Highly effective liquid boric acid products for ant control.
• How to control ants in a raised garden bed.
• Debbie Flower’s home recipe for ant control
• How outdoor ants are ecologically beneficial.