General Hydroponics Prevasyn Insect Repellant/Insecticide has a repellant effect on soft bodied insects and mites. Increases pest vulnerability to insecticides or miticides. This product acts on contact to weaken the cuticle of some immature stages of insect and mite pests. For best preventative results, this product must be applied at least once a week on a regular and continuous basis. The repellant effect of this product protects the crops from pest population establishment by its anti-feedant and anti-egg laying properties.