Zenivex^® E4 RTU is a mosquito adulticide for mosquito control professionals. Zenivex^® E4 RTU mosquito adulticide is a ready-to-use (RTU) formulation that requires no dilution, and no mixing. It’s an easy-to-use and highly effective solution to help professionals control adult mosquito populations. Like Zenivex^® E20, Zenivex^® E4 adulticide is hard on adult mosquitoes and easy on the environment.