I have a apple plant which is about 5months old(guessed). As you can see in the image below the new leaves are curling up. I don't know what causes this or how to treat for this. This has happened to other plants than apple plants in my garden. How do I treat this?
Soil: potting soil with cow dung mixed.
Plant gets full sun for the whole day.
Watering is done about every 2days.
Max temp 35C
Lowest temp 25C
(I know that it may not be possible to grow apples where I live. But I want to give it a try.)