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Avatar for Plantladyclaire13
Jun 4, 2018 12:28 PM CST
Weatherford TX
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 Icon for preview
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Jun 4, 2018 12:33 PM CST
Name: Karen
New Mexico (Zone 8a)
Region: New Mexico Region: Arizona Region: Ukraine Cactus and Succulents Plant Identifier Plays in the sandbox
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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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Jun 4, 2018 12:57 PM CST
Name: Lin Vosbury
Sebastian, Florida (Zone 10a)

Region: United States of America Region: Ukraine Region: Florida Charter ATP Member I was one of the first 300 contributors to the plant database! Million Pollinator Garden Challenge
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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.
~ 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!


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Jun 4, 2018 1:05 PM CST
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
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Don't use Neem on cactus.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost

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Avatar for Plantladyclaire13
Jun 4, 2018 2:46 PM CST
Weatherford TX
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!
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Jun 4, 2018 2:58 PM CST
Name: Baja
Baja California (Zone 11b)
Cactus and Succulents Seed Starter Xeriscape Container Gardener Hummingbirder Native Plants and Wildflowers
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Looks like a normal healthy cactus to me. Smiling
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Jun 4, 2018 3:43 PM CST
Name: Lin Vosbury
Sebastian, Florida (Zone 10a)

Region: United States of America Region: Ukraine Region: Florida Charter ATP Member I was one of the first 300 contributors to the plant database! Million Pollinator Garden Challenge
Birds Butterflies Bee Lover Hummingbirder Container Gardener Houseplants
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!


Avatar for Plantladyclaire13
Jun 4, 2018 4:54 PM CST
Weatherford TX
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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