Greetings. I saw that there this has been some discussion of the control of apple scab that is clearly on a Macintosh apple tree in our yard (planted three years ago and is/was otherwise thriving; seemed to have about 75 apples on it this year). I was hoping you might know what are the consumer products available to help control this fungus that I can use in Toronto. I see that there are lots of sulpher-based treatments for purchase in the USA. Can these be used in Toronto?
Thank you for contacting Master Gardeners of Toronto. It is permissible to use sulphur-based treaments in Toronto. Please see this link for a comprehensive list of registered products:
For more information related to apple scab, please review the following website: