Larval Mosquito Collections from January 2020

Surveillance for mosquito larvae is a priority in the winter, as seasonal water sources have filled with rain water. A technician uses a dipper to take a sample of the water and visually inspects it for mosquito larvae. If larvae are present, the technician transports the sample to the laboratory for counts and identification. This January, 175 larval samples were submitted to the laboratory. The most frequently occurring species in larval samples was Aedes washinoi, present in 70 of the 175 samples. This mosquito is an aggressive mammal-biting mosquito that develops in fresh water marshes and ponds. It is not known to transmit diseases. Culiseta incidens, the cool weather mosquito and Culiseta inornata, the winter marsh mosquito, were also collected frequently this past month. Culiseta incidens larvae are found year-round in a variety of sources, especially backyard fountains and fish ponds. The larvae of Cs. inornata breed in during the cooler months of the year, and can be found in both saline and fresh water sources.