And, as of this writing, researchers have successfully begun to isolate specific fatty acids (such as those contained in soap) that are toxic to harmful insects but have little or no effect on beneficial ladybugs and bees.One such product is Safer Agro-Chem Insecticidal Soap, which is said to be effective against spider mites, aphids, white flies, mealybugs, soft scale, and other pests.