03Preheat oven to 350°F. Bake crust until light golden brown, about 30 minutes. Cool while preparing filling. Maintain oven temperature.
04Combine pear pieces, 3 tablespoons sugar, 2 tablespoons orange juice and salt in large nonstick skillet. Cook over medium heat until pears are tender but still hold their shape, stirring often, about 6 minutes. Transfer pear mixture to large bowl; cool to room temperature. Add blueberries, flour and remaining 6 tablespoons sugar to pears; toss gently to blend.
05Transfer filling to cooled pie crust, mounding filling slightly in center. Sprinkle with Walnut-Streusel Topping. Bake pie until juices bubble thickly, fruit is tender and streusel topping is golden brown, about 1 hour 5 minutes. Cool pie on rack until lukewarm. Cut pie into wedges and serve.