2012 West Nile Virus Activities

2012 Media Releases

2012 Dead Bird Surveillance

2012 Adult Mosquito Surveillance

2012 Human Surveillance

2012 Equine Surveillance

Reports & Reference Material

Larviciding in 2012

Catch Basin Larviciding
Each year, throughout Durham Region, regionally and municipally-owned roadside catch basins are monitored for larval mosquito activity, beginning mid-May. Three rounds of catch basin treatments are conducted during the WNV season with the first round of treatment traditionally occurring in mid-June and subsequent treatments occurring mid-July and mid-August. To ensure effectiveness of the larvicide, the treatments are separated by a maximum of twenty-one (21) days.

In total, 158,650 roadside catch basins and a further 438 catch basins, located on regionally or privately-owned property, were treated.

Standing Water Larviciding
Beginning early May 2012, areas of standing/stagnant water were assessed as potential larval mosquito development sites. Where remediation of identified larval mosquito development sites was not possible, a biological larvicide was applied following a local risk assessment. A total of 2328 standing water site visits were conducted between May and September 2012, resulting in 1131 larvicide treatments.