Ask a Question forum→Help with cactus!!

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Weatherford TX
Plantladyclaire13
Jun 4, 2018 12:28 PM CST
My cactus got white powdery mildew from my other plant. Went to the garden supply store and got some neem oil extract but I'm not sure if I can spray it on the cactus because I've heard you're not supposed to get water on it?

Thank you in advance to anyone that can answer this!


[Last edited by Plantladyclaire13 - Jun 4, 2018 2:34 PM (+)]
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Name: Karen
New Mexico (Zone 8a)
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plantmanager
Jun 4, 2018 12:33 PM CST
Are you sure it's powdery mildew, and not mealy bugs? Mildew is extremely rare on cacti, but many are prone to mealy bugs.
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Name: Lin Vosbury
Sebastian, Florida (Zone 10a)

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plantladylin
Jun 4, 2018 12:57 PM CST
Hi Plantladyclaire13, Welcome!

Can you upload a photo of your cactus and perhaps a close up of the white stuff? It will better help identify exactly what the issue is, if we can see pictures.

I've never known a cacti to suffer with powdery mildew but I guess it's possible if one lives in a humid environment. If the problem is mealybugs, you can use Q-tip cotton swabs, dipped in rubbing alcohol to wipe them off.
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Name: Daisy I
Reno, Nv (Zone 6b)
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DaisyI
Jun 4, 2018 1:05 PM CST
Don't use Neem on cactus.
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Weatherford TX
Plantladyclaire13
Jun 4, 2018 2:46 PM CST
Thumb of 2018-06-04/Plantladyclaire13/c2ed07

Here you guys go! Hopefully this picture is good enough for you to see the white spots, this is how my other plant started too, so I searched online and found that it might be white powdery mildew. If you guys might know what it is or if it's just dirty, it'll be a great help! Thank You!
Name: Baja
Baja California (Zone 11b)
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Baja_Costero
Jun 4, 2018 2:58 PM CST
Looks like a normal healthy cactus to me. Smiling
Name: Lin Vosbury
Sebastian, Florida (Zone 10a)

Region: United States of America Deer Region: Florida Charter ATP Member Million Pollinator Garden Challenge I was one of the first 300 contributors to the plant database!
Garden Procrastinator Birds Butterflies Bee Lover Hummingbirder Container Gardener
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plantladylin
Jun 4, 2018 3:43 PM CST
It looks like a normal healthy cactus to me too. I see no signs of insects or mildew.
~ I'm an old gal who still loves playing in the dirt!
~ Playing in the dirt is my therapy ... and I'm in therapy a lot!


Weatherford TX
Plantladyclaire13
Jun 4, 2018 4:54 PM CST
Yaaay okay thank you!! Since my other plant had it I thought it might have caught it too. So glad it's okay!

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