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November 22, 2023

The Pest Management Regulatory Agency (PMRA) recently approved a minor use label expansion registration for RootShield WP biological fungicide for suppression of root rot caused by Pythium spp., Rhizoctonia spp., and Fusarium spp. in Canada. RootShield WP biological fungicide was already labeled for disease control on a wide range of crops in Canada. This minor use proposal was submitted by the Ontario Ministry of Agriculture, Food, and Rural Affairs 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 RootShield WP biological fungicide.




Rate (g / L)

Application Information

PHI (days)

Crop Groups 25 (Herbs – Greenhouse and Field)) and 26 (Spices - Field)

Suppression of Root rot caused by Pythium spp., Rhizoctonia spp., and Fusarium spp. – Drench application

55 – 110 g / m3 OR 30 – 45 g /100L

Suspend RootShield® WP - Biological Fungicide in sufficient water (eg. 30 – 45 g/100 L) to achieve uniform application and apply at the rate of 55 – 110 g per cubic metre (loose) of nursery potting mix, soil or planting beds. Within the stated rate range, use higher rates when conditions favour disease development or high disease pressure is anticipated RootShield® WP - Biological Fungicide can be applied through low pressure watering nozzles such as fan nozzles or other watering systems. Agitate to maintain suspension.




For a copy of the new minor use label contact your local extension herbs and spices specialist, regional supply outlet, or visit the PMRA label site


Source:  Josh Mosiondz, minor use coordinator, OMAFRA November 14, 2023



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Submitted by Karen Davidson on 22 November 2023