The Problem

Citrus Collar Rot

Phytophthora citrophthora

What is Citrus Collar Rot?

Collar rot is a fungal root disease which usually affects the trunk of citrus just
above soil level. Do not allow soil or mulch to pile up above the grafting union. Cut the bark back
to healthy growth and spray foliage with Yates Anti Rot. 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.

What are the symptoms?

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.

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Solutions