The best homemade bug killer depends on the pest, but several effective DIY recipes using common household ingredients can kill or deter insects without commercial pesticides, though they work best for minor infestations and not for severe German cockroach or bed bug problems. For ants and cockroaches, a boric acid and sugar bait is highly effective, mixing one teaspoon boric acid with one tablespoon sugar and one tablespoon water to form a paste placed in bottle caps behind appliances, as roaches eat it and carry it back to the colony, but keep away from children and pets. For soft-bodied garden pests like aphids, whiteflies, and spider mites, insecticidal soap made from one tablespoon Dawn dish soap, one tablespoon vegetable oil, and one quart water sprayed directly on insects suffocates them by breaking down their outer coating and is safe for most plants. For fruit flies, a trap made from apple cider vinegar with a few drops of dish soap in a jar with a paper funnel traps and drowns them. For mosquitoes, a spray of witch hazel, water, and 10 drops each of citronella and eucalyptus oil can deter them short-term. For general crawling insects, food-grade diatomaceous earth sprinkled lightly in cracks and behind appliances dehydrates insects over several days. For fleas, washing bedding in hot water plus vacuuming thoroughly with a soapy water trap under a nightlight can catch adults. Always test on a small area first and avoid inhaling powders, and for persistent pests hire a professional.
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