Rotten apples and other fruits should definitely not be left in the trunk area. Because of them, you can expect an invasion of pests and the development of diseases.
Rotten apples are considered to be good composting material that can be used as a good fertilizer.
Here's what experienced gardeners say about this.
Rotten apples and compost
Rotten apples that have fallen or been picked from the tree are not usually used to create fertilizer.
Often it is a case of rot caused by disease.
The same applies to any fruit crop - rotting berries, cabbage and even diseased vegetation.
In each case, we may be talking about diseases such as root rot, clubroot, powdery mildew, rust and other diseases.
You can't put such organic matter into a compost pit.
What to do with fallen fruit
There is no consensus here. Some gardeners use it as a fertilizer, while others try to recycle it.
In fact, fallen fruit with minor defects can be used as a compost additive.
But these must be fruits from a healthy tree and they must be collected immediately. It is also believed that during the 2 years of compost maturation, pests that can live in the apple will also die.
But you shouldn't compost fallen stone fruits. Pome fruits are considered ideal for this.