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Euphorbia disease advice?

2 months ago
last modified: 2 months ago

Hi there. I have had my Euphorbia for around 5 years and have just noticed some dark patches around the stem.Can anyone tell what this is and advise me on what to do to treat any problem that there may be.The cactus was moved to a slightly lower light spot in a corner but it has still been beneath a sky light in a modern ventilated house.