From the apple tree (white filling), the age of up to 20 years, in Sochi, in the process of ripening, fruits fall en masse. What is the reason?
Cut the apple - if it is wormy, then the codling moth has visited it and here you can’t do anything. So that this does not happen on the days of departure of the codling moth - May-June - you need to spray the garden.
Another reason is that the tree is “starving” and cannot bear the harvest. Need good water in the fall, and especially manure.
Separately, there is the issue of irrigation - if the water is mineralized, and sometimes this is given to summer cottages, then consider yourself unlucky. What to do? Better to rely on the sky than give the tree poisonous water.