Mix flour and sugar together and combine 3/4 of it wiht the fruits.
Line 9-inch pie plate with bottom crust. Sprinkle remaining dry ingredients over the bottom. Add fruit mixture on top. Dot with butter. If desired, arrange pastry strips to form a lattice top crust.
Bake in 425 °oven for 10 mins. Then reduce heat to 350° and bake 30 mins. longer or until fruit is tender.