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August 2020 CO2 Trap Collections

The following table and graph show the average number of mosquitoes collected per CO2 trap per night during the month of August compared to the five-year average for the six most common mosquito species in San Mateo County. Culex erythrothorax was the most frequently collected mosquito in August, with numbers more than twice the five-year average. These mosquitoes are collected in tule marshes, which will be treated by helicopter. Culex pipiens, typically the most common mosquito trapped in August, is at average levels this year. Based on previous years, overall mosquito abundance is expected to begin to decline next month and continue to decrease for the remainder of 2020.

Species

August 2020

5-year August average

Culex erythrothorax

13.52

5.84

Culex pipiens

9.50

9.61

Culiseta incidens

0.96

1.67

Culex tarsalis

0.84

1.09

Aedes sierrensis

0.02

0.18

Aedes washinoi

0.02

0.04

 

Commands