Phytophthora citrophthora


What is Citrus Collar Rot

This is a fungal root disease which usually affects the trunk of citrus just above soil level. 



A section of bark around the base of the tree dies back and falls away from the main trunk. Sometimes oozing gum and cracking around the dead section occurs. Leaves turn yellow. Tree loss can occur if left unchecked.


How to Protect your plants

Cut the bark back to healthy growth and spray foliage with Yates Anti Rot. A spray of Liquid copper can also be applied to the affected bark lesion. Do not allow soil or mulch to pile up above the grafting union. Susceptible trees (especially lemons) should be given a preventative foliar spray with Anti-Rot twice a year. For cultural control, improve air flow by removing any mulch touching the bark of the tree. Improve drainage around the tree if water logging occurs frequently or if the ground is damp often. 


Plants impacted

  • Citrus trees

Recommended products

Yates Liquid Copper

A broad-spectrum fungicide for control of a wide range of diseases on fruit, vegetables and ornamentals.

More articles

Brown Patch

Brown Patch is caused by a fungus and usually occurs in late spring, summer and autumn when the weather is warm and humid.


Sunburn may affect plants that are exposed to very hot weather.

Frangipani Rust

Talk to Yates for the right product to protect and treat frangipani rust. We have the experience and expertise to help you get the best results with our products.

Iron Deficiency

Iron deficiency is a plant disorder which can sometimes be confused with manganese deficiency.