Insecticidal Soap is defined as any of the potassium fatty acid soaps used to control many plant pests and diseases. This product is typically sprayed on plants in the same manner as other insecticides. It works only on direct contact with the pests. The fatty acids disrupt the structure and permeability of the insect cell membranes and the insect quickly dies. Soaps of this kind also work well on fungus infections such as botritis and leaf spot as well as on common houseplant pests such as spider miteSpider Mites, members of the Acari family, are small insects about 1mm in size. The most common indoor plant mite is the red spider mite (also called the two-spotted spider mite.). These pests lay their eggs on the under surface of leaves and produce fine webbing especially where the leaves are attached to the stem. Spider mites are hard to see with the naked eye, and may appear only as small red dots. They are more often recognized by the gritty feel of the leaf when you run your finger down it’s length, or by the appearance of discolored leaves due to the sucking action of the mites. The best way to prevent spider mites is to keep your plants clean and dust free. Treat spider mites by spraying every ten days for a month with a product such as Safer Insecticidal Soap. and mealy bugSee a picture, learn to identify and treat Mealy Bugs, a houseplant pest that leaves sticky,white, cottony residue on houseplants..