Preheat oven to 375°F.
Fit pie crust into pie plate.
In a large bowl, mix sliced apples, lemon juice, both sugars,flour, cinnamon and nutmeg.
Pile into crust.
Prepare topping:.
In a medium bowl, with a pastry blender or a fork, mix flour, both sugars, and butter until coarsely crumbled.
Sprinkle evenly over apples.
Bake at 375°F for 50 minutes.
