We would recommend applying a product like Bifen IT in our Chapin Slide Pump Sprayer. This sprayer will reach well over 30ft. We do not carry any products that can be applied in a pressure washer for this type of insect control. You will mix the product at 1 oz per gallon of water per 1,000 sq ft monthly on the exterior. Please let us know if you need anything else.
We are not aware of any issues with using a bifenthrin product on St Augustine. This active is known for being super gentle on plants, so it should not harm it when used as directed on the product label.
There is not an expiration date printed on the Bifen IT bottle. This product will last for 3-5 years from the date of purchase if kept sealed and stored at room temperature.
Bifen IT will kill termites that come in contact with the chemical. To eradicate termites you want to use a product that has a transfer effect. Termidor SC is a great product to use to treat termites. Please see our Termite Control Page. Scroll to the bottom of the page and find information on identification and treatment for termites.
The label does not authorize to apply Bifen IT to any type of carpeting. You will want to focus treat the cracks and crevices of the room along baseboards, corners, door and window frames with a hand pump sprayer for a residual control. We advise to vacuuming consistently and sanitizing the treated area will help eliminate the fleas quicker. We also suggest using an IGR (insect growth regulator) such as Archer IGR to prevent the future infestation from developing for a better control.
While you could tank mix the two, the Mosquito Barrier is going to work against the effectiveness of the Bifen I/T for probably at least the first week or two. You are spraying Bifen on surfaces moquitoes would land on and harbor in so that when they touch the treated surface they pick it up on their bodies and die from it. If you are spraying Mosquito Barrier you are using it to repel the mosquitoes away from areas you dont want them or are trying to keep them from harboring. So essentially by mixing the two together, you are repelling the mosquitoes away from the Bifen I/T so it would not affect them. Outside of an initial contact kill the mosquito barrier isn't going to provide killing action for you long term, only repellency. Bifen is actually the better product to use on a consistent basis in main target areas on the property where mosquitoes would be found, and use the Mosquito Barrier around patios and other "hangout" areas to keep them at bay until they have died from landing on the Bifen-treated surfaces.