Adult mosquito surveillance conducted during the week of July 12-18, 2020 detected Culex tarsalis activity in all of the twenty-one (21) sentinel communities. No WNV infected mosquito pools were detected. A total of zero (0) WNV positive mosquito pools have been collected this season. Surveillance has not detected any additional positive WNV surveillance indicators (e.g. human cases, birds or horses) anywhere in the province. There are currently no orders for adult mosquito control related to West Nile virus.
Mosquito activity is increasing and warm temperatures, in particular in the evening are conducive to Culex tarsalis activity. Soil moisture levels and standing water vary considerably throughout the central and southern portions of the province, with some areas experiencing overland flooding and other areas are very dry. Culex tarsalis tends to be more common when conditions are hot and dry as they use small water pools, such as cattle watering troughs, bird baths, and other containers to lay their eggs. Nuisance mosquitoes, which do not carry West Nile can be persistent biters of people and pets are more common in wet conditions where large puddles and water-filled ditches provide ample habitat for egg laying and larval development.