Which of the following is an adulticide registered for use in Michigan?

Sumithrin is the correct answer as it is an adulticide registered for use in Michigan. Adulticides are substances used specifically to target adult mosquitoes and are an essential part of integrated pest management practices in controlling mosquito populations.

Sumithrin is a synthetic pyrethroid that acts quickly to kill adult mosquitoes upon exposure, making it an effective choice for public health mosquito control efforts, especially during outbreaks or when mosquito populations are particularly high. It is often used in fogging operations to provide immediate control of adult mosquito populations in residential areas.

While malathion is also noteworthy as it is an adulticide, it is not exclusively registered for use as it is often considered for specific applications and monitoring. Other options like temephos and pyriproxyfen serve different purposes—temephos is primarily a larvicide designed for controlling mosquito larvae, while pyriproxyfen is an insect growth regulator that inhibits the development of juvenile mosquitoes. Therefore, they do not fit the criteria for adulticides in Michigan.