Culex erythrothorax, a mosquito that breeds in lakes and ponds with tules, was the most frequently collected mosquito in September.  The high number of tule mosquitoes this month reflects a large seasonal emergence of this species in Pacifica. The abundance of Cx. erythrothorax declined from August to September, but the number remains considerably above the five year average. Adults of this…

The District conducts intensive surveillance for invasive Aedes mosquitoes during the summer months. The surveillance program mainly targets two container-breeding species, Aedes aegypti and Aedes albopictus, which have been increasing their range within California over the last several years. The presence of these mosquitoes is highly undesirable because they are aggressive human biters and also…