Say goodbye to spider mites! SNS 217C™ kills mites and their eggs. It is fully biodegradable and non-toxic to animals. How it works: Natural salts and fatty acids derived from rosemary extracts disrupt the insect cell structure. Cell contents then leak from damaged cells causing spider mites to dehydrate and die. SNS 217C™ kills the spider mite eggs by coating them with an oily shield that disrupts the respiration to the egg; therefore no hatching will occur, they will just dry out.