Houseplants forum: Powdery mildew?

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DeathProphet
May 15, 2017 5:53 AM CST
Hello,

I really need some help. I purchased African Violets online and some of them have these whitish spots on them like a powder. Is it a powdery mildew fungus? Any suggestions what to do? Confused
Thumb of 2017-05-15/DeathProphet/afde0b
Thumb of 2017-05-15/DeathProphet/a2fec6

Name: Alyssa Blue
Ohio (Zone 5b)
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AlyssaBlue
May 15, 2017 7:39 AM CST
It looks to me as if water sat on the leaves for some period. But the top plant looks like it does have some type of fungus problem and I'm not sure how it will fare. Violets aren't very forgiving once a problem starts.

My thought is to spray the super refined horticultural oil on it. I used that on a fern to stop the spread of a fungus and it worked. And then set the plants aside in a protected spot and see how they do. Never spray horticultural oil on a plant and set it in direct sun- it will cause the leaves to soften and you'll end up with light green spots. (Lesson learned)

I also would keep them semi-separated so the healthier one can't pick up anything from the sick plant. I always quarantine plants that aren't doing well.

Good luck. Water as you usually would, and hope it picks up!
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Hamwild
May 15, 2017 7:41 AM CST
Hmm, I'm not sure about the first, but the second just looks like water dried on the leaves (hard water will do that especially).

I once got powdery mildew on an AV and believe it or not, it cleared up with a mix of water and milk. I sprayed daily until it was gone. I can't remember the ratio I used, but I just looked online and some recommend as much as 40% milk, 60% water, diluted to as little as 10% milk, 90% water, but there's reslly no wrong I don't think, just somewhere in there.

I didn't get any issues with smell or molding, etc, I think it's because it's diluted enough.
Name: Alyssa Blue
Ohio (Zone 5b)
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AlyssaBlue
May 16, 2017 10:26 AM CST
Yes, I've heard of milk working also, just haven't used it. Well, that is the cheaper option and easier to find!

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DeathProphet
May 17, 2017 11:59 AM CST
Thank you all for your feedback.
I do think the both of the plants have powdery mildew. I tried to clean the white spots in both and it looks cleaner after that but you still see the white spots on the plant leaves.
I have uploaded a video of the one that looks like dying. Could you please take a look and let me know if I can do anything to save the plant? Sad
youtu.be/qA69H95YwnI
Georgia (Zone 8a)
Region: Georgia Enjoys or suffers hot summers Dog Lover Houseplants Cactus and Succulents Annuals
Foliage Fan Birds Critters Allowed Hummingbirder Butterflies Bee Lover
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Hamwild
May 17, 2017 1:58 PM CST
Ooh my, it does look rough. Did it dry out too much or get too hot?

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DeathProphet
May 17, 2017 2:33 PM CST
I am not sure. I received it in a parcel 2 weeks ago. It did look a bit sick.
Do you think I can do something about it?
Georgia (Zone 8a)
Region: Georgia Enjoys or suffers hot summers Dog Lover Houseplants Cactus and Succulents Annuals
Foliage Fan Birds Critters Allowed Hummingbirder Butterflies Bee Lover
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Hamwild
May 17, 2017 7:49 PM CST
Honestly, I just think time will tell. I'd keep it moist (not too wet, not too dry), keep it out of the sun (like, enough light to make an AV happy, but not too much) and see what happens. And don't fertilize it, fertilizing a sick plant won't make it un-sick.
Name: Christine
Saugerties, NY zone 5a
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Christine
May 20, 2017 6:33 AM CST
I've used the milk solution 50/50 on my Lilac start last year and it worked like a charm, and she came back this year looking great, no fungus, so it does work on powdery mildew if thats the issue with your AV Confused

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