West Umatilla Mosquito Control District
ADULT SURVEILLANCE: MOSQUITO LANDING RATES

Landing rates are used to measure adult mosquito activity in a specific area. This is achieved by counting the number of mosquitoes that land on a person in a given amount of time, usually one minute. The same inspector at each location for consistency performs the counts. This is important because mosquitoes react differently to each individual. Several landing rate stations are located throughout the 525 sq. miles of the West Umatilla Vector Control District. Each station is counted daily by 9 a.m. throughout the entire mosquito season. This count is effective for monitoring floodwater mosquitoes that bite in the early morning and during the day. Occasionally, the district performs night counts for permanent-water mosquitoes. This helps the district to determine the extent of the area that needs to be sprayed, or whether an isolated portion needs to be treated. Landing counts are also very helpful when evaluating the efficacy of an adulticide treatment.


West Umatilla Mosquito Control District

Dedicated to the Protection of Public Health Through the Reduction of Public Health Vectors