Controlling biting or stinging insects

Stinging insects are a common source of inconvenience. Gnat (commonly called black fly) and mosquito bites can cause itching and even allergic reactions, while some mosquitos are vectors of pathogens that include West Nile Fever.

Some municipalities and tourism organizations take steps to control these insects and the problems they cause in order to make daily activities less of a nuisance.

Pesticides used to control the larvae of stinging insects are directly applied to water, as follows:

  • Lake outlets and gravelly rapids where black fly larvae develop;
  • Stagnant natural (peat bog and swamp) bodies of water where mosquito larvae are found, or man-made ditches and ponds.


Ministerial authorization

Authorization This hyperlink will open in a new window. from the Ministère de l’Environnement et de la Lutte contre les changements climatiques is required before a pesticide can be applied in an unconfined aquatic environment (e.g., a stream, river, lake, marsh or swamp).

The authorization process satisfies the Ministère that all required measures will be taken to minimize the environmental impact of the pesticide and that its use is necessary at the target locations.

Land application of pesticides

If your company uses land-based pesticides to control stinging insects, it must hold a Sub-class C9 or D9 “Application for control of stinging insects” permit.

If you personally apply insecticides, you must hold a Sub-class CD9 “Application for control of stinging insects” certificate or perform the work under the supervision of an on-site holder of this type of certificate.

Aerial application of pesticides

If your company sprays pesticides to control stinging insects from an airplane, it must hold a Subclass C1 or D1 “Aerial application” permit.

If you personally spray pesticides from an airplane, you must hold a Sub-class CD1 “Aerial application” certificateor perform the work under the supervision of an on-site holder of this type of certificate.

Environmental impact assessment and review procedure

When the area of application exceeds 600 hectares, airplane spraying is subject to the environmental impact assessment and review procedure This hyperlink will open in a new window. that includes an impact study and, potentially, public hearings.

Rules governing the application of pesticides

Even if your company holds a permit for the control of stinging insects, the application of pesticides to control adult black flies and mosquitoes is prohibited unless specifically carried out as a complement to larvicide application (PDF 7.31 Mb) (French only).
If you spray pesticides from an airplane, the following is required:

  • Mark the boundaries of application areas or use air corridor guidance prior to pesticide application;
  • The pilot or application supervisor must have a map or aerial photograph at hand that identifies the permitted and prohibited application zones extending 300 metres around the spraying area;
  • Publish a message This hyperlink will open in a new window. describing the work to be carried out in a newspaper circulated in the territory where the work will be carried out or broadcast the message on a radio or television station in that territory from one to three weeks prior to the start of spraying in a transportation corridor or over an area greater than 100 hectares in a single administrative region in a single year;
  • Comply with the distancing parameters for sensitive areas (PDF 293 Kb) (French only).

Read the application of Commercial Pesticides webpage for information about the general rules governing the preparation and application of pesticides and the Pesticides Management Code – Reference Manual (PDF 7.31 Mb) (French only).

Notice to reader

The information on this website has been modified for popular consumption and constitutes a summary of the main applicable regulatory provisions. It in no way replaces the official wording of laws and regulations. For more detailed information on any particular rule, refer to the Pesticides Management Code This hyperlink will open in a new window..

Last update: May 8, 2022


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