Bougainvilleas Plaque

Any ideas what is plaquing these bougainvilleas and how to treat ?

The leaves with the light and dark areas indicate a lack of nutrients, but I don’t know what’s causing the light brown patches.

Is the problem all over the tree or in selected areas? Am curious if it could be physical damage or damage from cold.

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Just bought them from a local nursery, it’s happening all over. I put a little bougain fertilizer to get them some nutrients.

Thanks, still no ideas. Will let you know if something comes to mind.

I grow bougainvillea, I think the problem is excessive moisture in the roots.
The first job I do when buying bougainvillea is to change the soil with 100% inorganic.

But know that the same signs appear on the leaves when there is a lack of water. But rarely this happens in bougainvilleas because they love dry soil.