Troubleshooting
Purpus's Dioon problems — and how to fix them
Purpus's Dioon (Dioon purpusii) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Crown rot
Caused by overwatering or poorly drained substrate. The trunk base becomes soft and discoloured. Remove affected tissue, dust with sulphur fungicide, allow to dry, and replant in fresh gritty mix. Prevention via correct watering is critical.
Scale insects
Armoured and soft scales colonise the undersides of leaflets and the trunk, causing yellowing and frond dieback. Scrub off with a soft brush dipped in isopropyl alcohol and apply horticultural oil spray; repeat every 10–14 days.
Manganese deficiency
Presents as yellowing of new fronds (frizzle-top) in alkaline or waterlogged soils. Drench with manganese sulphate solution and ensure pH stays below 7.5 and drainage is adequate.
Prevent purpus's dioon problems before they start
Most purpus's dioon issues are care-mismatch, not bad luck. Dial in the basics:
Looking for purpus's dioon in general rather than its problems? Read the full purpus's dioon care guide — light, water, soil and feeding.
Purpus's Dioon problems — FAQ
Why is my purpus's dioon crown rot?
Caused by overwatering or poorly drained substrate. The trunk base becomes soft and discoloured. Remove affected tissue, dust with sulphur fungicide, allow to dry, and replant in fresh gritty mix. Prevention via correct watering is critical.
Why is my purpus's dioon scale insects?
Armoured and soft scales colonise the undersides of leaflets and the trunk, causing yellowing and frond dieback. Scrub off with a soft brush dipped in isopropyl alcohol and apply horticultural oil spray; repeat every 10–14 days.
Why is my purpus's dioon manganese deficiency?
Presents as yellowing of new fronds (frizzle-top) in alkaline or waterlogged soils. Drench with manganese sulphate solution and ensure pH stays below 7.5 and drainage is adequate.