Pyronyl Oil UL-100,(formally Prentiss brand) is a synergized pyrethrin concentrate with a mineral petroleum distillate base for use in ULV equipment for fogging.
Active Ingredient in Pyrony Pyrethrinl Oil Concentrate 1% is 1% pyrethrin with a 4.94% dual synergist . It can be mixed with oil; cannot be mixed with water.
Works as advertisedI bought a gallon to control Silverfish in my attic. I fog once a year in the spring with a mosquito fogger and it has eliminated the problem. This product isn't expensive when you consider I'm still using the gallon I bought several years back.