In a large bowl, combine the first seven ingredients. Combine flours, pie spice, baking soda, baking powder and salt; stir into pear mixture until blended. Fold in nuts. Pour into two greased 8x4-in. loaf pans. Bake at 350° for 55-65 minutes or until a toothpick inserted in the center comes out clean. Cool in pans for 10 minutes; remove to a wire rack to cool completely.