Safer's Trounce Yard & Garden, Concentrate, 1LSafers Trounce Yard & Garden Insecticide combines pyrethrins and potassium salts of fatty acids to kill insects on contact. The pyrethrins attack the insects nervous system and potassium salts weaken the insects protective outer shell. Controls a variety of insects including aphids, caterpillars, beetles earwigs, and whitefly. Trounce can be used on fruit trees, landscape trees, ornamentals, flowers, shrubs, and vegetables.