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r/SoCalGardening
7
Posted by4 months ago

White powder on roses

I noticed that most of my rose buds and leaves have a thin white powder on them. Looks like this is a really bad sign for my rose bushes and I have to start aggressively cutting back to protect the rest of my plants. I already have to prune these bushes back tremendously as they have become overgrown and woody from the previous home owner. :(

Any fungicide recommendations immediate use as well as regular maintenance during growing seasons? I'm not particular between toxic versus natural solutions.

r/SoCalGardening - White powder on roses
6 comments
77% Upvoted
level 1

Check out bio advance 3 in 1, I've had great results with it on my roses

3
level 1

This is white mildew. Use neem oil to treat.

3
level 2

This, rose powdery mildew. Neem oil hits it, it thrives in moisture so trimming away dead leaves and watering at ground level will help the plant stay a bit drier.

1
level 2
Op · 4 mo. ago

Got it, I read that neem oil is advised as a preventative measure or at first signs of the fungus so I'll definitely use it during future growing seasons. Because this fungus has now spread to most of the bush, I'm also looking for an immediate fungicide to use, whether that be neem or another option.

1
level 1

Powdery mildew. Reference this website for pest and plant disease management: http://ipm.ucanr.edu/PMG/PESTNOTES/pn7493.html

1
level 1

Regular maintenance during growing season: Put 2-3 cups water in a spray bottle, add the juice of one lemon, and four drops of bleach. Spray the canes and leaves before it gets this far.

1

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