Early apple drops

For some reason, all of the apples on several of my fall apple varieties have already fallen by early August, before they have ripened. These varieties are supposed to ripen in September and/or October. These trees are about 10-12 years old and each had 2-3 bushels on them. Any ideas on causes?

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Was it enough water for them this season? Also apples affected by the moth can drop premature.

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