City crews will begin spraying for mosquito larvae in standing water by helicopter in and around the city this week weather permitting.

“Our most successful method for reducing pest populations is to attack the immature stages of the pest's life cycle when they are most vulnerable,” said Mike Jenkins, biological sciences technician with the City of Edmonton.

The cool weather this spring has slowed down larvae development giving city crews a much bigger window of opportunity to attack the larvae, he said.

Mosquito larvae are found in the highest concentrations in standing water, such as roadside ditches and non-permanent pools of water.

Attacking larvae is more desirable than fogging adult mosquitoes because it doesn't affect beneficial insects like dragonflies, Jenkins said. 

The city budgets between $1.2 to $1.3 million each year for mosquito control.