Skip to main content
Phostrol hazelnut screen shot
Phostrol hazelnut screen shot
December 20, 2021

The Pest Management Regulatory Agency (PMRA) recently announced the approval of a minor use label expansion registration for Phostrol fungicide for suppression of Phytophthora root rot (Phytophthora spp.) on hazelnuts in Canada. Phostrol fungicide was already labeled for management of diseases on a wide range of crops in Canada. This minor use proposal was submitted by the British Columbia Ministry of Agriculture, Food, and Fisheries 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 Phostrol fungicide.




(L product/ha)

Application Information

PHI (days)


Phytophthora root rot (Phytophthora spp.)

2.9 – 5.8 

For preventative suppression of phytophthora root rot begin foliar, drench, or drip irrigation applications when conditions are favourable for disease (i.e. wet conditions or at early symptoms of disease).  Continue on a 14 day interval up to a maximum of 4 applications per year.


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.


Follow all other precautions, restrictions, and directions for use on the Phostrol fungicide label carefully.


For a copy of the new minor use label contact your regional supply outlet, or visit the PMRA label site:


Source:  Josh Mosiondz, minor use coordinator, OMAFRA. 

Standard (Image)
If latest news
Check if it is latest news (for "Latest News" page)

Add new comment

Plain text

  • No HTML tags allowed.
  • Lines and paragraphs break automatically.
  • Web page addresses and email addresses turn into links automatically.
Submitted by Josh Mosiondz on 20 December 2021