Ask a Question forum→How to Stop White Fungus

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Ventura, CA
May 9, 2020 10:15 AM CST
How do I stop white fungus on hibiscus?
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[Last edited by Scottwh21 - May 10, 2020 11:51 AM (+)]
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Name: one-eye-luke US.Vet.
Texas (Zone 8a)
Quitter's never Win
Hummingbirder Birds Organic Gardener Dog Lover Cat Lover
May 9, 2020 2:22 PM CST
Powdery mildew is a common disease on many types of plants. There are many different species of powdery mildew fungi like, Erysiphe spp, Sphaerotheca spp, and each species only attacks specific plants. Don't overhead water your pants and keep the falling leaves pick up and thrown away to prevent it from spreading. Wet leaves cause Powdery mildew and the spores lives on the infected leaves waiting for the right conditions. .
NOT A EXPERT! Just a grow worm! I never met a plant I didn’t love.✌
Milpitas, CA
May 9, 2020 3:10 PM CST
You gotta cut them off. They mature during the day in the sun, and release pores at night, under the moon. And then spread like crazy. I had to cut down a few of my plants to stop it from spreading.

It's gonna be a real hack job, but it's either that, or you lose the foliage and flowers anyways, AND it could spread to your other plants.

Check your other plants. And cut the leaves that have it, cut the adjacent ones, even if you don't see it. Good luck. I don't want to tell you to cut, cut, cut. I don't want to tell you to do something that could kill your plant. But mildew is not lovely. You could just let it be. And it will die when the seasons change. And next year you will have green foliage again. Do not water overhead, or at night. Water very early in the morning. Mildew forms when it is humid and wet, at night. Humidity is present in the cold. So don't think it has to be hot or warm. Although, warmer temps do help it grow faster.

Good luck again!
Name: Luis
Hurst, TX, U.S.A. (Zone 8a)
Dog Lover Region: Texas Salvias Roses Hibiscus Plumerias
May 10, 2020 11:44 AM CST
Are these hydrangeas? The leaves do not look right for hydrangeas. Maybe hibiscus? Hard to see the shrubs in all the foliage. Maybe a shot from afar might help.
Ventura, CA
May 10, 2020 11:53 AM CST
Thank you so much! I will cut back the infected parts and only water in the morning.
Name: Carol
Santa Ana, ca
Sunset zone 22, USDA zone 10 A.
Charter ATP Member Bookworm Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California
Plant Identifier
May 10, 2020 12:19 PM CST
There are numerous sprays for mildew/fungus available, and if you're in the coastal area it will be quite a while before you see much sun. "May Grey" and "June Gloom" are facts of life in coastal areas.... and again Never Water Overhead!

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