Troubled Interstate Bakeries Corp., in bankruptcy since September 2004, early today said it is closing four bread bakeries in Southern California. The closings will eliminate 1,300 jobs, which besides those in the bakeries, include jobs impacted by route consolidations. Interstate, the maker of iconic Hostess Twinkies, will continue to make and sell snack cakes in Southern California. In midday over-the-counter trading, Interstate Bakeries shares were up 10 cents, or 9.09 percent, at $1.20. The company said the pullout was due to lower-cost, non-union competitors, and irrational pricing, Those factors, combined with high fixed costs, have continued to make the market...