Troubleshooting
Tamanu problems — and how to fix them
Tamanu (Calophyllum inophyllum) 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.
Root rot in heavy soils
In clay or waterlogged soils, roots are prone to fungal rot. Ensure excellent drainage or plant on a raised mound. Symptoms include yellowing leaves and wilting despite moist soil.
Leaf spot (Pestalotiopsis spp.)
Brown or grey spots with yellow halos may appear in wet conditions with poor air circulation. Remove affected foliage and avoid overhead irrigation. Copper-based fungicide can be used for severe cases.
Scale insects
Armored and soft scales can colonise branches and stems, causing yellowing and sooty mould. Treat with horticultural oil spray; systemic insecticide may be needed for heavy infestations.
Prevent tamanu problems before they start
Most tamanu issues are care-mismatch, not bad luck. Dial in the basics:
Tamanu problems — FAQ
Why is my tamanu root rot in heavy soils?
In clay or waterlogged soils, roots are prone to fungal rot. Ensure excellent drainage or plant on a raised mound. Symptoms include yellowing leaves and wilting despite moist soil.
Why is my tamanu leaf spot (pestalotiopsis spp.)?
Brown or grey spots with yellow halos may appear in wet conditions with poor air circulation. Remove affected foliage and avoid overhead irrigation. Copper-based fungicide can be used for severe cases.
Why is my tamanu scale insects?
Armored and soft scales can colonise branches and stems, causing yellowing and sooty mould. Treat with horticultural oil spray; systemic insecticide may be needed for heavy infestations.