Riechel Reports - Events - City of San Bruno CA

Mosquito Distrtict April 2021 Newsletter

Article Source:  San Mateo County Mosquito & Vector Control District

April 2021
Hand holding small plastic bag while pouring water in from a cup-like mosquito 'dipper'
Marsh areas can breed millions of mosquitoes. Technicians are regularly checking areas where water collects during the rainy months to determine if treatment is needed. While checking a marsh near East Palo Alto, technician Evan found mosquito larvae. This picture shows him pouring the sample from a mosquito 'dipper' into a sample bag to take back to the laboratory for identification.
Board of Trustees Meeting Schedule
The Board of Trustees is NOT meeting tonight (the usual day/time of the meeting).  The Board will be meeting next Tuesday, April 20th via Zoom. In May, the Board will resume its usual meeting schedule; the Board will meet next month on Wednesday, May 12th. Board of Trustees meetings will be held remotely via Zoom until further notice. Download meeting agenda.
Mosquito Population Update
Surveillance for mosquito larvae in seasonal impounds and marsh sources continues to be a priority, as they continue to hold water from winter rainfall. A technician uses a dipper to take a sample of the water and visually inspects it for mosquito larvae. If larvae are present, the technician transports the sample to the laboratory for counts and identification. This March, 94 larval samples were submitted to the laboratory. The most frequently occurring species in larval samples was Culiseta incidens, the cool weather mosquito, present in 51 of the 94 samples. This mosquito is a common mosquito present year-round in San Mateo County. Aedes washinoi and Culex tarsalis, the western encephalitis mosquito, were also collected frequently this past month. Aedes washinoi is an aggressive mammal-biting mosquito that develops in fresh water marshes and ponds. Culex tarsalis larvae are collected from a wide variety of sources, such as grassy impounds, marshes with mild salinity, ponds and agricultural fields. This species is of particular concern for mosquito control operations because it is a primary vector of West Nile virus. Read more.
Tick-Borne Disease Surveillance
During March, laboratory staff continued surveillance for adult Ixodes pacificus (Western black-legged ticks) and began nymphal Ixodes pacificus surveillance during the last week of the month. Ticks are collected by dragging a 1 meter square sheet of white flannel over the vegetation alongside trails. Ixodes pacificus ticks will be tested for the presence of Borrelia burgdorferi, the bacterium that causes Lyme disease, as well as Borrelia miyamotoi and Anaplasma phagocytophilum. Areas that were surveyed in March were Crystal Springs Regional Trail mear Millbrae, Aņo Nuevo State Park near Pescadero, trails near the Costanoa resort near Pescadero, Edgewood Park in Redwood City and Thornewood Open Space Preserve near Portola ValleyRead more.
March Service Requests
In March, the District responded to a total of 153 resident service requests, including 40 reports of mosquitoes or standing water, 39 rodent inspection requests, 34 yellowjacket and wasp requests, and 8 dead bird reports. Read more
Dead Bird Hotline Now Open

With West Nile virus (WNV) season approaching, the California WNV and Dead Bird Call Center is live as of Monday, April 12th. Call center hours are 8:00 am to 4:30 pm, Monday through Friday. The number is 877-WNV-BIRD (877-968-2473). Public online reporting is available 24/7 at westnile.ca.gov


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