By Josh Mosiondz, Minor Use Coordinator, OMAFRA
The Pest Management Regulatory Agency (PMRA) recently announced the approval of a minor use label expansion registration for RootShield® HC Biological Fungicide for suppression of Botrytis blight and Root rot caused by Pythium spp., Rhizoctonia spp., and Fusarium spp. in Canada. RootShield® HC 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® HC Biological Fungicide.
| Crop(s) | Target | Rate | Application Information | PHI (days) |
| Crop Groups 25 (Herbs – Greenhouse and Field) and 26 (Spices) | Suppression of Botrytis blight (Botrytis cinerea) – Foliar Application | 3.75 – 7.5 g product / L | For suppression of Botrytis cinerea apply 3.75-7.5 grams per liter of water to foliage every 7-14 days depending upon disease pressure. | 0 |
| Crop Groups 25 (Herbs – Greenhouse and Field) and 26 (Spices) | 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® HC – Biological Fungicide Wettable Powder 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® HC – Biological Fungicide Wettable Powder can be applied through low pressure watering nozzles such as fan nozzles or other watering systems. Agitate to maintain suspension | 0 |
As this pesticide is not registered for the control of pests in aquatic systems, DO NOT use to control aquatic pests. DO NOT contaminate irrigation or drinking water supplies or aquatic habitats with this product. DO NOT clean equipment or dispose of wastes in any water supply. To reduce runoff from treated areas into aquatic habitats, avoid application 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 strip between the treated area and the edge of the water body. DO NOT apply by air.
Follow all other precautions, restrictions, and directions for use on the RootShield® HC Biological Fungicide label carefully.
Crop Group 25 and 26 includes hundreds of herb (including many edible flowers) and spice crops including many culinary herbs (including lavender) and most spice crops. For a full listing, click on either CG25 or CG26 at the following link: https://www.canada.ca/en/health-canada/services/consumer-product-safety/pesticides-pest-management/public/protecting-your-health-environment/pesticides-food/residue-chemistry-crop-groups.html. This registration does not apply to herbs that are in other crop groups including cilantro, dill and parsley (CG4) and chives (CG3).
For a copy of the new minor use label contact 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
Note: This article is not intended to be an endorsement or recommendation for this particular product, but rather a notice of registration activity
