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For a stronger option try this recipe: 1 cup sugar, 3 tablespoons boric acid, and 3 cups warm water. Combine the ingredients in a jar, put some cotton inside the lid of the jar, and saturate it ...
Fleas, spiders, termites, flies, centipedes, ants, bedbugs, cockroaches — these icky intruders won't give up. But keeping them away doesn't require expensive chemical pesticides.
Boric acid is a weak acid, with pK a (the pH at which buffering is strongest because the free acid and borate ion are in equal concentrations) of 9.24 in pure water at 25 °C. But apparent p K a is substantially lower in swimming pool or ocean waters because of interactions with various other molecules in solution.
Boric acid is not a bait in the dry form, but rather broadcast as a dust, that is both a toxin and a desiccant. Boric acid is often formulated into a paste. Roach attractants are mixed with the boric acid. It is similar in consistency to toothpaste. Boric acid roach baits consist of a proprietary blend of attractants.
“Ants have palates, and if they don’t take the bait immediately, you’ll need to try a different formula,” says Suiter. “It’s not like they’re going to change their minds.”
Borate-sucrose water baits are toxic to Argentine ants, when the bait is 25% water, with 0.5–1.0% boric acid or borate salts. [ 52 ] [ 53 ] In spring, during a colony's growth phase, protein based baits may be more effective due to much higher demand from the egg-laying queens.