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One tablespoon (14.79 milliliters) of soap to one gallon (3.79 liters) of water is the ratio of soap to water to spray lupines for aphids. A little bit will be effective since home-made and store-bought insecticidal soaps kill insect pests by the equivalent of drowning and suffocation. A large amount of soap will not have the environmental impact of huge amounts of high-concentrated vinegar even though it may be irritating to edible, ornamental or wildflowering plants.

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