How to save orange tree with mossy trunk?

tmay

we have an orange tree next to a lime tree that has grown for many years. Suddenly the orange tree trunk has developed moss with mushrooms, often growing at its base. Leaves have changed colour to a very light green and it appears that there is some sort of mite on the backs of the leaves multiple small branches are now there, and I think rats are climbing through and destroying the new growth. The lime tree on the other hand which is directly next to it looks amazing and all advice. Much appreciated 

EricL

Hello @tmay 

Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about your orange tree.

 It sounds like your orange tree is under quite a bit of stress, especially compared to your healthy lime tree right next to it. The symptoms you're seeing—moss and mushrooms on the trunk, pale leaves, possible mites, dieback, and rat damage—suggest a combination of problems that are weakening the tree. Here's a focused approach to help bring it back to health:

First, the mushrooms and moss at the base often mean the area is staying too damp or the tree is struggling internally. Mushrooms feed on decaying wood, so there may be rot or damage in the roots or trunk. Clear away any mulch or soil piled against the trunk, and ensure there’s good airflow around the base. Avoid watering too close to the trunk and try to let the area dry out a bit.

The pale leaves could mean a nutrient deficiency, especially nitrogen, which is common in stressed citrus. Feed your tree with a citrus-specific fertiliser like Yates Thrive Natural Citrus & Fruit Plant Food or Richgro Citrus Food, both found at Bunnings. Apply it around the root zone and water it in well. A seaweed tonic like Seasol can also help support root health and boost recovery.

Check under the leaves for mites—they’re tiny, but if you see webbing or clusters of dots, mites are likely the issue. Use Eco-Oil it's both safe and effective against mites. Spray under the leaves and repeat weekly until under control.

As for the rats, try pruning the lower branches to remove their access and reduce clutter in nearby plants or structures. You can also use rodent deterrents like Ratsak Stations, available at Bunnings.

Even though it’s struggling, your tree may still bounce back with proper support.

Here is a handy guide that will help: How to Grow, Prune And Care For An Orange Tree 

If you need further assistance, please let us know.

Eric