What to feed the loquat tree.
Feed your loquat three times a year with a nitrogen rich fertilizer such as a lawn fertilizer (without an herbicide or use 6-6-6). These articles should help:
https://www.gardeningknowhow.com/edible/fruits/loquat/growing-loquat-fruit.htm
https://www.gardeningknowhow.com/edible/fruits/loquat/loquat-losing-leaves.htm
I actually planted 2 at the same time and conditions. Have treated them equal and the 2nd is still doing great and has grown about a foot.
Unfortunately, your photos did not come through. I am unable to see the damage. Because the other one is doing well, I would suspect that it is the luck of the draw.
Another thought is Fireblight. Erwinia is a brutal disease. Usually, this will infect all of the similar trees in the area. Maybe it hasn't started yet.
You can either treat it, or remove it and start over, with treatment in between. It can be tricky to treat.
These articles will help:
https://www.gardeningknowhow.com/edible/fruits/loquat/treat-fire-blight-in-loquat-trees.htm
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/edible/fruits/loquat/growing-loquat-fruit.htm
I have 2 lowquats about 15 ft apart. They are about 10 ft tall and 15 yrs old. One of the trees has begun dropping a considerable amount of leaves but still has new growth appearing. The other tree is not dropping leaves. What can I do?
This article should help:
https://www.gardeningknowhow.com/edible/fruits/loquat/loquat-losing-leaves.htm
What would the replacement cost of a loquat tree approximately 10-12 feet. Thanks, Margie
I would contact your local garden centers, or online nurseries. We do not sell anything and I cannot recommend specific places for purchase. We only offer gardening advice.
I can offer some articles on the care of the tree:
https://www.gardeningknowhow.com/edible/fruits/loquat/growing-loquat-fruit.htm
https://www.gardeningknowhow.com/edible/fruits/loquat/growing-loquat-seeds.htm