Mosquitoes are most active between dusk and down. If you need to be outside at this time, cover up and use an insect repellent for extra protection. Make sure screens on your home are tight-fitting and in good repair. York Region Community and Health Services does not recommend the use of but boxes as an effective method for mosquito control as several bats in York Region have tested positive for rabies in past summers mra smaï¬me Sunâ€"Iï¬buneISaMday, May}, 2003 13