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By the UC Master Gardener Program of Fresno County
Comments:
by IT Telkom
on January 12, 2025 at 1:32 AM
What should you do if your rose plant shows signs of a fungal disease like botrytis or rust, and how can you prevent the spread of these diseases?
by Debbie DiNoto
on January 13, 2025 at 4:30 AM
Hello IT Telkom,  
You can follow the information listed in the hyperlink above about trying to avoid botrytis and rust. Good sanitation practices are important such as removing old blossoms, plant debris, weeds, etc. Avoid wetting leaves and using an irrigation system such as drip can also help. There are a lot of different fungi out there that can cause these situations, so unfortunately, one size does not fit all and prevention is worth a pound of cure.  
You can use a dormant oil, such as a neem oil, horticultural oils, or sulfur, as a preventative, but may have to apply it more than once. Make sure you use the precautions listed on the label when applying.  
You can also use potassium bicarbonate to help prevent or help to eradicate fungal diseases. There is also a biological fungicide, Bacillus subtilis that can be used as well.  
There are roses out there that are more resistant to diseases (especially rust), than others. I have had rose friends tear out certain roses that they described as "rust buckets" and replace them with more resistant varieties as a final resort.  
Best of luck in growing your beautiful roses. Most of these fungal conditions will disappear as the weather grows warmer in the spring.
 
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