Available primarily as an emulsifiable concentrate, these materials are used mainly as space sprays for fly control. About 6 million square feet of the area in North Carolina poultry houses (3 percent) are treated with pyrethrins. The insecticide (synergized with PBO) is generally applied at a rate of to pound of active ingredient per 1,000 cubic feet of volume. It is used to treat 6 percent of breeders and layers for mites and lice at a rate of approximately pound of active ingredient per 100 birds. Orthoboric acid (SafeCide) Available primarily in dust formulations and used for.
