Total service requests this May are low compared to the five-year average (228 requests compared to an average of 278 requests). The lower-than-average total amount is mainly because of the low number of mosquito service requests (67 in 2022 compared to an average of 114) although the number of requests has risen since earlier in the spring. Yellowjacket and wasp service requests continue to rise…

All of the six most common mosquito species in San Mateo County averaged less than five collected per trap, which is within typical range for the month of May. After a peak in April, the numbers of Culex erythrothorax fell dramatically in May, an indication that larvicide applications by unmanned aerial systems (UAS) in areas along the coast were successful. Unusually, the most frequently…