What Is Camellia Leaf Gall and What Should You Do About It?
If your camellia's new leaves are swelling, turning pale and powdery and then falling, this is for you — what is happening, and the routine that deals with it.
What Camellia Leaf Gall Looks Like
Leaf gall shows up on new growth, usually in spring. Instead of opening normally, new leaves swell and thicken into fleshy, distorted growths — often several times the thickness of a healthy leaf. They start out pale green or pinkish, then develop a whitish, powdery underside before eventually shrivelling and falling.
It looks alarming, and most people have never seen it before — but it is a known, manageable problem, and it rarely threatens the life of an established camellia.
What Causes It
Leaf gall is a fungal disease. The powdery white stage is the fungus releasing spores, and those spores are the next season's problem: they settle on the plant and in the litter beneath it, ready to infect the following spring's new growth. Mild, damp spring weather — very Auckland — suits it well.
Why Spraying Alone Doesn't Fix It
The most common mistake we see is spraying the shrub while the galls — and the fallen, infected leaves under it — stay put. Every gall left on the plant or on the ground is a spore source, so the infection simply returns with the next flush of growth.
The physical clean-up is not optional. Treatment supports it; it does not replace it.
The Routine That Works
Remove the affected leaves — ideally before they reach the powdery, spore-releasing stage — and get them off site rather than into the compost. Clear the fallen, infected material from the ground beneath the shrub. Then an appropriate copper-based treatment is applied to protect the remaining growth.
One pass is often not enough: on an established infection we repeat the process over two or three visits so that new galls are caught as they appear and the spore cycle is properly broken.
When To Act
Spring, as the new growth emerges, is when galls appear and when removal matters most. Autumn and winter are for hygiene — clearing fallen material so spores are not waiting under the shrub. If your camellias get leaf gall every year, that cycle is the reason.
This is exactly the kind of issue a regular maintenance team catches early — swollen leaves get spotted and dealt with in passing, before the powdery stage spreads spores for next season.
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