How to Make Homemade Insecticidal Soap for Plants tablespoons soap to 1 gallon of water OR 1 heavy tablespoon soap to 1 quart of water-(add vinegar for downy mildew) for controlling aphids, whiteflies, spider mites and mealybugs on my container herbs.
A versatile repellent for everything from tiny aphids to marauding deer, cayenne pepper spray is one of the go-to formulas for organic gardeners -- especially thrifty ones. The homemade insecticide reportedly will also repel such damaging garden pests as
Homemade Insecticidal Soap Spray Note: Buy a liquid soap and not a detergent. Health food stores have liquid soaps, such as Dr. Bronner’s Pure-Castile Soaps. Insecticidal Soap Spray 1 to 2 tablespoons liquid soap 1 quart water