Stubbornly high mosquito counts are sending the city malathion trucks out for a third round of fogging.
The city says that the north half of the city will be fogged overnight Wednesday, with the south half fogged the next night. Victoria Avenue is the dividing line.
Fogging with malathion is highly weather dependent, and requires temperatures to be above 13ºC, winds no more than 16 km/h and zero rain.
Residents have until 7 p.m. on the night of fogging to apply for a 90-metre buffer zone around their property. They can do so in person or online, but have to provide a proof of residency. On Tuesday, the city had received a total of 117 buffer zone applications — that's up about nine from last week, but down from 2013 and 2010.
According to the city, fogging trucks travel between 6–32 km/h while spraying malathion, but may turn off the flow and drive faster through buffer zones.
They say that, despite the persistently high numbers of mosquitoes, the province has tested the malathion and found it effective. They expect each round of fogging to kill between 50–60 per cent of adult mosquitoes.
The latest trap numbers show a citywide average count of 1,688 mosquitoes caught on Sunday, with 1,158 mosquitoes caught on Monday. The worst area was the cemetery, where 3,160 mosquitoes were caught on Sunday.