What Is Happening To The Leaves On My Apple And Plum Tree

Question

They have been in 18 months, pear tree next to them is fine

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Answer 1

The photo on the left shows insect damage including leaf miners and spider mites. Spraying Neem oil will kill spider mites. Leaf miners are inside the leaves and difficult to control.

The second photo shows chlorosis of the leaves, where the leaf yellows between the veins. It also has some fungal spots and wilting. These articles should help with resolution:

https://www.rhs.org.uk/problems/chlorosis

https://www.rhs.org.uk/fruit/fruit-trees/feeding-and-mulching

https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-treatment.htm

https://www.gardeningknowhow.com/plant-problems/pests/insects/holes-in-plant-leaves.htm

https://www.gardeningknowhow.com/edible/fruits/fegen/common-fruit-tree-diseases.htm

https://www.gardeningknowhow.com/edible/fruits/apples/apple-tree-diseases.htm

https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-diseases.htm