Changes to the chlorothalonil pesticides registration (agricultural and turf uses)

All pesticides used in Canada must be registered under the Pest Control Products Act. Pesticides are re-evaluated to ensure that they continue to meet health and environmental requirements. Re-evaluation may result in the revocation of a product or product uses. Health Canada may also request changes to a product's label, including mitigation measures, use sites and application methods.

Chlorothalonil is a fungicide used on field and orchard crops, conifers, greenhouse vegetables, greenhouse and outdoor ornamentals and turf. Highlights of the re-evaluation decision for the active ingredient chlorothalonil, published on May 10, 2018, are summarized below.

Cancelled products, as of May 10, 2021

Stop use of products available in dry flowable or water dispersible granules form:

• Products in these two formulations must be packaged in water-soluble packaging

Label changes for chlorothalonil pesticides, as of May 10, 2020

Cancelled uses

Stop uses on the following crops:

• Greenhouse ornamental cut flowers
• Greenhouse pachysandra
• Field grown rose for cut flowers

Other risk reduction measures

Use prohibited on greenhouse food crops, except for crops specifically indicated on the label

• Closed loading system required:
  • For application on potatoes
  • When more than 340 kg chlorothalonil/day are applied with a boom sprayer
  • For aerial application
• Limit of three applications per year on potatoes
• Hand harvesting of treated processing tomatoes prohibited
• Public not allowed on golf courses after late fall snow mold application
• Restricted-entry intervals (REI) updated
• Addition to personal protective equipment (PPE) requirements, depending on type of application and daily rate applied
• Updated buffer zones
• Obligation to install and maintain a vegetative filter strip (VFS)

Users must follow the instructions on the updated labels.

Using a pesticide contrary with the label directions is a violation of the Pest Control Products Act.

Read the label

All pesticides registered in Canada have a Health Canada-approved label with a registration number. Read the pesticide label carefully, as it contains specific information on how to use it.

To find the most up-to-date label, use our online label search tool, or search for "Health Canada pesticide labels" using your favourite search engine.