In December 2023, there were distinct fluctuations of various mosquito species when compared to their five-year December averages. Culex pipiens, a species known for its widespread distribution, exhibited a decreased average count of 0.744, notably lower than its five-year average of 1.557. Conversely, Culex tarsalis displayed a higher count of 0.103 compared to its five-year December average of 0…

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…