The corn market is signaling technical weakness, and we wonder how long discretionary fund longs will be willing to hang on. They need a weather problem to bail them out, and there is no sign that one is forthcoming. General Comments It was a deeply red day for grain and soy markets after the long holiday weekend. The downward trend began immediately when the overnight session opened Monday evening, and it never let up through the close of the day session. Good weekend planting weather in the U.S., weakening values around the world and rumors of more Chinese cancellations of Brazilian soybean purchases all served to press prices lower. Wheat and corn prices set new lows for this downward move. We are not sure that this is much to brag abo...