The total number of service requests is below average for this month of the year (398 compared to an average of 503). This is the lowest number of service requests in the month of September in the past five years. The number of yellowjacket and other wasp requests declined from August to September, likely because of the seasonal change of cooler nights and shorter hours of daylight. However…

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…