Ask a Question forum: white spots

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New York
Planturion
Jul 14, 2017 10:42 AM CST
I have white spots on my cactus and I am not sure what is causing it. I water it only once or twice a month if it's dry, so I'm pretty sure I'm not overwatering it and I don't see any parasites. The container I have it in has drainage. Thoughts?
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Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Jul 14, 2017 3:43 PM CST
Welcome!

Are all the white spots on one side of the cactus? So if you turn it around, the other side doesn't have white spots? Do you turn it periodically? Is this an insded plant or an outside plant?

Have you moved it recently? Repotted recently? Fertilized recently?

Do the spots feel dry and hard? Or soft?
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

Webmaster: osnnv.org
New York
Planturion
Jul 14, 2017 9:19 PM CST
This is an inside plant. The spots are on multiple places on the cactus on various sides. I do rotate it so one side isn't always getting the sun. It has been repotted recently to give it fresh dirt but the spots have been there for some time and are getting increasingly worse. They feel soft to the touch. I haven't fertilized. I only use distilled water.
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Image
DaisyI
Jul 14, 2017 10:27 PM CST
Hmmm... Soft usually means rot. White patches usually mean sunburn. If a cactus (or any plant) gets too much sun too fast (without acclimation), it will sunburn . If the sunburn spots are yellow, the tissue is damaged but probably not irreparably (the spots will usually dry up and the plant will survive). If the sunburn spots are white, the tissue damage is much worse and the chance of rot increases.

To check out what might be going on with your cactus, take a very sharp knife and cut the end off one of the pads with a white spot (Photo #3, the pad in front on the right looks good). Slice through the white spot and take the top off. If it is brown in the middle, the pad is rotting. If it is green in the middle, its still healthy and we will have to look for a cause elsewhere.

Post a photo of the middle of the pad so we can see also.

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

Webmaster: osnnv.org
New York
Planturion
Jul 15, 2017 6:10 PM CST
The top part where the spot was is dry on the inside and the rest of the pad is green. I guess I'll try moving it out of the sun. None of my other plants are getting spots so I don't know why this one didn't like the light.
Thumb of 2017-07-15/Planturion/a390ea

Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Image
DaisyI
Jul 15, 2017 8:56 PM CST
Yes, sunburn but not fatal at this point.
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

Webmaster: osnnv.org

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