Cactus
Q.

cactus sunburn

Zone Phoenix Arizona | Anonymous added on June 13, 2019 | Answered

I want to know if my sunburned cactus(it is part of my landscaping) could be from lack of water as well as the hot summer sun. I live in Phoenix. I've had the cactus for about 13-15 years and last year was the first year that this happened. Maybe it could be an age thing too. Anyway I'm going to get some shade netting I guess and lay it over the cactus and the 3 offspring. I'm sorry I don't know the name of the cactus, but it grows very slowly and has little yellow flowers around the top of it in the spring. Also it has a sort of furry white top. If you can give me any advice about this I would be very grateful to have it. Thank you. Delores

A.
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Downtoearthdigs
Certified GKH Gardening Expert
Answered on June 14, 2019

You may have a barrel cactus, and it may have a fungal disease called Pythium rot.

Sunburn is not likely, but wounding and associated fungal infection is a possibility.

Review the following article and see if that makes sense.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/barrel-cactus/pythium-rot-in-barrel-cactus.htm

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