BMatthews

Well, yes and no.

When the airfoil is stalled it has a big turbulent bubble on the top side which trails behind the wing. You can see this sort of image on any basic description of lift and airfoils that includes pictures.

But just because the air breaks away from the airfoil and creates the stalled condition it doesn't mean that the lift goes away. But why the airplane drops the nose and goes into a dive is because with that sudden break away of the upper surface airflow comes a HUGE increase in drag. And without lots of power the speed drops fast when the stall occurs and the wing no longer has enough lift to keep the airplane up. And when that happens the airplane does drop. But the tail has enough effect on all this to hold the tail back and the nose drops off into a dive. At that point the speed rises, the wing gets back to work and the pitch stability built into the trim of the plane raises the nose back so it flies away at the original trimmed airspeed..... unless the pilot is still holding a lot of back stick. In that case the nose continues to rise up to another stall.

If you have enough power you can actually keep the airplane flying even when it's stalled. We can see this on videos of over powered aerobatic models that are flying in the "harrier" mode at a 45'ish degree angle of flight. Part of the lift comes from the prop and part from the wing in this case.