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The Pesticides Regulatory Directorate (PRD), formerly known as the Pest Management Regulatory Agency (PMRA) recently approved a minor use label expansion registration for Serifel biological fungicide for suppression of powdery mildew on hops grown in Canada. Serifel biological fungicide was already labeled for disease control on a wide range of crops in Canada. This minor use proposal was submitted by Agriculture & Agri-Food Canada, Pest Management Centre (AAFC-PMC) as a result of minor use priorities established by growers and extension personnel.
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 label before using Serifel biological fungicide.
Crop(s) | Target | Rate (kg of product / ha) | Application Information | PHI (days) |
Hops | Suppression of Powdery Mildew (Podosphaera macularis [syn. Sphaerotheca macularis]) | 0.25 – 1.0
| For powdery mildew, begin applications prior to infection and continue on 5- to 10-day intervals if conditions are favourable for disease development. Use the highest rate and the shortest interval when conditions favour high disease pressure. Under low-level disease conditions, the minimum application rates can be used while maximum application rates and the shorter spray intervals are recommended for severe or threatening disease conditions. Apply SERIFEL in sufficient water to ensure thorough coverage of foliage, bloom, and fruit. Thorough coverage is required for optimum disease control. Maintain agitation of product during the application process. The product mixture should be applied shortly after mixing. DO NOT store mixed suspensions of SERIFEL overnight. SERIFEL DOES NOT require a spray buffer zone. | 0 - SERIFEL can be used up to and including the day of harvest. |
Follow all other precautions, restrictions, and directions for use on the Serifel biological fungicide label carefully.
For a copy of the new minor use label, contact your local specialty crops specialist, your regional supply outlet, or visit the PMRA label site http://www.hc-sc.gc.ca/cps-spc/pest/registrant-titulaire/tools-outils/label-etiq-eng.php
Source: Josh Mosiondz, provincial minor use coordinator, OMAFA, April 21, 2026
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