Total service requests this August are low compared to the five-year average (392 requests compared to an average of 557 requests). The lower number is because of fewer than typical yellowjacket/wasp requests, which has been consistent over the summer. Yellowjacket requests have fallen in number slightly since July, although August is usually the peak month. Mosquito requests are somewhat above…

The most frequently collected mosquito in August was Culex pipiens, with an abundance close to average for the month of August. Another mosquito, Culex erythrothorax, has been trapped at far below average numbers (3.172 per trap-night compared to the five-year average of 18.381). This species breeds in marshes that contain tule (cattail) plants. The District treats larger tule marshes by drone or…