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I agree that lack of heat can contribute to the yellowing and crinkly leaves. I believe it’s actually a combination of the cold weather and fungal diseases. In the Winter, I always have some trees that yellow a bit and have some fungal damage.
It is usually the mango trees that had a late vegetative growth or that didn’t harden its growth flush before the cold weather that gets the yellow leaves with burnt edges that are often crinkly.
Foliar sprays with micro/trace nutrients have not helped in my yard during cold weather. I usually just leave the tree alone until it warms up. Around June-August, sometimes beginning a little earlier and ending a bit later, we get our best vegetative flushes and you should time your fertilization regimen to maximize growth during those months.
Simon
Yes, there can be root infections by fungus or bacteria, promoted by overly soggy soil. This reduces nutrient uptake.
Also likely is nutrient tie-up, by overly fresh mulch in heavy quantity, or by plant-suppressive substances in the leaves in the mulch. Some trees, such as Black Walnuts, are very successful at preventing other kinds of plants from growing in the Black Walnut's leaf litter.
Your plants' leaves are showing multiple deficiencies including not enough Copper and Zinc and Boron. Manganese and Iron are also probably inadequate.
If your tree was planted in a hole filled with compost or potting soil, the tree should be dug out and replanted in native soil.
I had many trees which I put the free local mulch on (with eucalyptus). All the trees which had this mulch had the same curl issues, and they vanished when I removed it.
Dunno if it's of any help, but it seemed to fix my curl issues.
Would you ship to Florida 4-5 pounds? How much for shipping?
Thanks