Wheat:  Net sales of 442,600 metric tons for 2018/2019 were down 7 percent from the previous week and from the prior 4-week average.    Corn:    Net sales of 349,500 MT for 2018/2019 were reported for Mexico (275,800 MT, including decreases of 2,600 MT), Colombia (208,500 MT, including 167,000 MT switched from unknown destinations), Honduras (47,800 MT), Costa Rica (37,000 MT), and Tunisia (19,300 MT, switched from France).  Reductions were reported for unknown destinations (164,500 MT), South Korea (69,000 MT), Vietnam (60,000 MT), and France (20,500 MT).  For 2019/2020, total net sales were reported for Mexico (28,000 MT).  Exports of 1,213,200 MT were primarily to Mexico (405,000 MT), Colombi...