To control mosquitoes, the Health Department will apply larvicide by helicopter to marsh and other non-residential areas of Staten Island, the Bronx and Queens this week. The application is scheduled for Thursday, September 10; Friday, September 11 and Monday, September 14 between the hours of 6:00 A.M. and 7:00 P.M. In case of bad weather, application will be delayed until the next day during the same hours. While three days are allotted for this activity, the application may be completed in less time. Although West Nile Virus has been detected in mosquitoes in New York City this summer, no human cases have been identified this season.