Thak youWelcome to the forums Daca. I think that looks like shot hole fungus, and if it was on my apple tree I would leave it alone. The tree will probably sort itself out. I wouldn't want to start spraying with fungicide, especially as it may not have any effect anyhow.
If you see lots of ants, they will be looking for aphids. For a severe attack of aphids, you just need to spray them with water and washing up liquid.
Spraying chemicals on food crops might not be a good plan.
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