Good day, the apple tree is in this state, please help identify the disease or pests
Most likely the apple has a scab fungal disease! The main method is the destruction of the source of infection, that is, diseased leaves. Every year in autumn, it is necessary to rake the fallen leaves, we throw them into compost. And for prevention, it is better to spray with a 10% solution of ammonium nitrate. I also advise you to spray them with growth stimulants at the beginning of budding! I wish you good luck with your treatment!