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March 2020 CO2 Trap Results

The following table and graph show the average number of mosquitoes collected per CO2 trap per night during the month of March compared to the five-year average for the six most common mosquito species in San Mateo County. Counts for all species are averaging below five per trap night, which is consistent with the five-year average. The numbers are expected to remain low until after spring rains.

Species

March 2020

5-year March average

Culex pipiens

3.11

4.25

Culiseta incidens

0.57

0.55

Culex erythrothorax

0.42

0.16

Aedes washinoi

0.18

1.04

Culex tarsalis

0.03

0.8

Aedes sierrensis

0

0.18

Commands