Our Apple Tree Is Looking Sick
leaves struggling to survive, half amount of foulage this year and no fruit. now in autumn
Certified GKH Gardening Expert
Unfortunately, your photos did not come through. It will be very hard to say what is wrong without seeing the damage.
This could be due to many reasons. It can be fungal/bacterial infections, nutrient toxicity or deficiencies, pH imbalances, or insect damage.
Here some articles that will help address some of those concerns: