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Sierra Natural Science 217C Mite Control Concentrate, Pint. SNS-217’s unique formula works by providing a barrier which is harmless to the plant, but fatal to the mites. The natural salts and fatty acids derived from Rosemary extracts disrupt the insect cell structure and increase the permeability of its membranes. Cell contents then leak from damaged cells and the spider mites quickly dehydrate and die. SNS-217 Spider Mite Control kills the spider mite eggs by coating the eggs with an oily shield that disrupts the respiration to the egg; therefore no hatching will occur, they will just dry out. â¨Our Product has been tested in our lab on delicate new growth, clones, tomatoes, roses and other plants. Sierra Natural Science 217C Mite Control Concentrate, Pint