Unusually, Culex pipiens abundance has dropped over the spring, rather than rising. Throughout the year, Culex pipiens is consistently our most or second most frequently captured mosquito, but this April seasonal spring species are more abundant. Most notably, Culex erythrothorax was captured in high numbers, far above the five-year average for April. Most of these were collected from traps in the…

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…