Which species of mosquito found in Iowa can transmit La Crosse encephalitis?

La Crosse encephalitis is predominantly transmitted by specific species of mosquitoes, particularly Culex pipiens and Culex tarsalis. These species are known vectors for the virus that causes La Crosse encephalitis, primarily affecting small mammals and can be transmitted to humans through mosquito bites.

Culex pipiens, commonly referred to as the common house mosquito, and Culex tarsalis are both prevalent in various regions, including Iowa. Their ability to thrive in urban and suburban environments makes them prominent vectors for transmitting viruses and diseases such as La Crosse encephalitis.

The other species listed do not have a notable association with transmitting La Crosse encephalitis. Aedes vexans and Ochlerotatus trivittatus are more associated with other viral diseases, while Anopheles quadrimaculatus primarily serves as a vector for malaria rather than La Crosse encephalitis. Thus, the identification of Culex pipiens and Culex tarsalis as the correct answer aligns with the known vectors of this particular disease.