Can Damaged Sagos Be Saved?

Question

We have several sago palms that are several years old. One has been “treed” and is estimated 30 years old. So they have lived thru a lot. Last fall, the fronds started to turn yellow and then brown. We cut one completely back, but it’s new growth came back yellow. Then in December, we had a short very cold spell which probably did additional damage. So I’m wondering systemic or weather or both. One arborist guessed root fungus but not at all convincing. As I said they are in the same location, growing conditions where they have been for years with no problem. Any suggestions for saving them will be greatly appreciated.

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Answer 1

I would, also, agree with the Anthracnose diagnosis. That is what it appears to be. You could be seeing signs of MANGANESE not magnesium) deficiency, alongside that.

https://www.gardeningknowhow.com/ornamental/trees/sago-palm/sago-palm-diseases.htm

https://www.gardeningknowhow.com/plant-problems/disease/anthracnose-disease.htm