Description Pybuthrin 33 5lt is a ready-to-use natural pyrethroid spray is ideal for controlling flying insects, by fogging or misting, in a wide variety of premises including those where food is handled. Pybuthrin 33 may also be used as a non-residual direct contact spray for crawling insect control. Pybuthrin 33 contains 0.38% natural pyrethrins. Download the Pybuthrin 33 safety data sheet. PROFESSIONAL USE ONLY.