My donkey tails developed brown spots

I have several donkey tails that I have raised (many from propagating) over many years. Never had a problem with them but recently one of the healthiest ones has brown spots on it. I keep in a pot on my patio (northwest corner) and it gets direct sun. I live in the San Francisco Bay area which has a mild temperature in summer, rarely above 70-75. Any suggestions?

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1 Comment To "My donkey tails developed brown spots"

#1 Comment By Downtoearthdigs On 06/22/2015 @ 3:03 am

Dry brown spots are a sign of under watering.

If the spots are soft it is most likely leaf spot disease.
This can be treated with a fungicide.
Adding circulation among your plants is a good idea.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/burros-tail/burros-tail-care.htm ^[1]
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