Need to get rid of fleas? Well wait no more! NyGuard IGR Concentrate is a very effective pesticide that treats more than 50 pests! IGR stands for “insect growth regulator” this means the Nyguard IGR is a juvenile hormone mimic that breaks the life cycles of cockroaches, fleas, mosquitoes, ants, flies and many, many more. Nyguard IGR works indoors and outdoors so it can be very versitile in treating more areas.