Wheat:  Net sales of 468,400 metric tons for 2018/2019 were up 21 percent from the previous week and 32 percent from the prior 4-week average.   Corn:  Net sales of 1,383,700 MT for 2018/2019 were reported for Mexico (344,600 MT, including decreases of 100 MT), South Korea (204,300 MT), Peru (148,900 MT, including 72,600 MT switched from unknown destinations), Japan (145,200 MT, including 44,900 MT switched from unknown destinations), and Costa Rica (135,900 MT, including decreases of 3,000 MT).  For 2019/2020, net sales of 9,700 MT were reported for Mexico.  Reductions were reported for El Salvador (9,000 MT) and Israel (700 MT).  Exports of 1,077,700 MT were primarily to Mexico (398,900 MT), Japan (96,0...