Brassica Vegetables Crop Protection Disease Featured Fungicides Minor Use Pest Management Vegetables

SWITCH® 62.5 WG Fungicide label temporarily expanded via Emergency Use Registration to help manage Alternaria Leaf Blight in Brussels Sprouts, Broccoli, and Cauliflower in Ontario, Quebec, Nova Scotia, Prince Edward Island, and Newfoundland and Labrador

By: J. MOSIONDZ, OMAFRA, Minor Use Coordinator, Guelph

The Pest Management Regulatory Agency (PMRA) recently announced the approval of an Emergency Use Registration (EUR) for SWITCH® 62.5WG Fungicide for suppression of Alternaria leaf blight (Alternaria brassicicola) on Brussels Sprouts, Broccoli, and Cauliflower in numerous provinces in Canada. This EUR for SWITCH® 62.5WG Fungicide on listed Brassica crops can be used only in Ontario, Quebec, Nova Scotia, Prince Edward Island, and Newfoundland and Labrador from July 8th, 2022, until July 7th, 2023.

SWITCH® 62.5WG Fungicide is labeled for management of diseases on a wide range of crops in Canada. The use on Brussels sprouts, broccoli and cauliflower has already been submitted for review as a full label expansion via an Ontario led provincial User Requested Minor Use Label Expansion (URMULE) with the hope for full registration by the 2023 field season. This EUR request was initiated by participating provinces in response to the reduced number of chlorothalonil applications permitted on the crops following RVD2018-11 and a lack of sufficient registered protective products to allow for proper rotation and season long disease protection. This EUR was led by Ontario in conjunction with the Fresh Vegetable Growers of Ontario (FVGO) and other participating province’s provincial Ministries of Agriculture and their local growers associations.

The following is provided as an abbreviated, general outline only. Users should be making disease management decisions within a robust integrated disease management program and should consult the complete emergency use label before using SWITCH® 62.5WG Fungicide.

Crop(s)TargetRate (g product/ha)Application InformationPre-Harvest Interval (PHI) (days)
Brussels Sprouts, Broccoli, Cauliflower  Suppression of Alternaria Leaf Blight (Alternaria brassicicola)775 – 975The first application should be made when disease first appears and continue on 7-to-10-day intervals. Apply in sufficient water volume to obtain thorough coverage; a minimum spray volume of 200 L/ha is recommended. Apply up to 3 applications per year.7

For these uses, Syngenta Canada Inc. has not fully assessed performance (efficacy) and/or crop tolerance (phytotoxicity) under all environmental conditions or for all crop varieties when used in accordance with the label. The user should test the product on a small area first, under local conditions and using standard practices, to confirm the product is suitable for widespread application.

TOXIC to aquatic organisms. Observe spray buffer zones specified under DIRECTIONS FOR USE. Fludioxonil is persistent and may carryover. It is recommended that this product not be used in areas treated with any products containing fludioxonil during the previous season. To reduce runoff from treated areas into aquatic habitats avoid applications to areas with a moderate to steep slope, compacted soil, or clay. Avoid application when heavy rain is forecast. Contamination of aquatic areas as a result of runoff may be reduced by including a vegetative filter strip between the treated area and the edge of the water body.

Follow all other precautions, restrictions, and directions for use on the SWITCH® 62.5WG Fungicide label.

For a copy of the emergency use label, Ontario growers may contact Josh Mosiondz, Provincial Minor Use Coordinator, OMAFRA, Guelph (226) 971-3407,, Katie Goldenhar, Pathologist – Horticulture, OMAFRA, Guelph (519) 835-5792,, or Travis Cranmer, Vegetable Crops Specialist, OMAFRA, Guelph (519) 835-3382, Non-Ontario growers from participating provinces may contact their local Provincial Minor Use Coordinator or provincial crop specialist(s).  Alternatively, you may contact your regional supply outlet, Syngenta Canada Inc. Representatives, or visit the PMRA label site

Note:  This article is not intended to be an endorsement or recommendation for this particular product, but rather a notice of registration activity

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