Baking soda mixed with powdered sugar can start killing ants within hours, but full colony impact usually requires repeated applications over several days.

Mix equal parts baking soda and powdered sugar and place small piles where ants travel, ideally along trails or near entry points, because the sugar attracts them and the baking soda reacts internally to disrupt digestion. Use shallow lids or bottle caps so ants can access the bait without spilling, and replace bait every twenty four to forty eight hours or when it is visibly gone or moist. Keep the area dry because moisture reduces effectiveness and causes the mixture to clump; if humidity is high, refresh with a dry batch and move baits to slightly protected spots. Monitor trails for signs of decreased traffic after the first day and continue baiting until you see no activity for two consecutive days, which often indicates colony impact. For indoor use, confine bait to areas out of reach of children and pets and clean up spilled bait promptly, since sugar will attract other pests. If the infestation is large or if you find live ants carrying brood or winged reproductive ants, expect a longer timeline and combine this tactic with exclusion techniques like sealing cracks and removing food residues to prevent reinvasion.

Common mistakes include expecting instant disappearance, which leads people to stop treatment too soon; keep bait in place and reapply as needed for at least three to five days to allow worker ants to carry the mixture back to the nest. Another issue is using wet or clumpy bait, which loses attractiveness and potency; always maintain a dry, powdery texture and replace batches that have absorbed moisture. A third problem is placing bait where it is not encountered by foraging ants, so observe trails first and position small, accessible servings along active paths rather than random spots, and avoid spraying insecticide near baits because that will repel ants and prevent transfer.

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