Ask a Question forum→Strange crust on cactus plant?

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Name: Aimee
Long Island (Zone 7a)
May 21, 2018 7:13 AM CST
This morning I noticed a strange crust spreading over my cactus plant. Is this scale or something else?
If it is scale, how can I save the plant?
Thank you,
Thumb of 2018-05-21/AimeeLane/a4232b

"I don't care about spots on my apples- leave me the birds and the bees"
Name: Daisy I
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
May 21, 2018 11:10 AM CST
Its not insects or disease. Something is not quite right with the root system so the bottom of your plant is drying.
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

President: Orchid Society of Northern Nevada
Name: Andrea Reagan
Astatula, Florida (Zone 9a)
I collect seeds
May 21, 2018 11:13 AM CST
I would suggest to take one of the healthy pads from the top and start your Opuntia mycrodasys
over again. That may be a sign of root rot.
Name: tarev
San Joaquin County, CA (Zone 9b)
Stay Home-Save Lives-Wear a Mask!
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Composter Cactus and Succulents Dragonflies Hummingbirder Amaryllis Container Gardener
May 21, 2018 11:37 AM CST
I am thinking the media has somehow stayed too wet, since it does not look gritty enough and then being by the window it got cold, so the roots may have suffered from some rotting.

Observe a bit more, it may just try to dry up some more, and just resume growing from there. Give it as much warmth and bright light as you can.

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