One bad apple spoils the whole barrel.
She really knows how to polish the apple.
The apple doesn’t fall far from the tree.
Don’t upset the apple-cart.
Adam ate the apple, and our teeth still ache.
It’s as American as apple pie.
Motherhood and apple pie.
You can’t compare apples and oranges.
When the apple is ripe, it will fall.
An apple a day keeps the doctor away.
Any more suggestions?