THE OPEN May beans:  13 1/4 higher May meal:  5.00 higher soyoil:  67 higher May corn:  1 higher May wheat:  5 higher Prices opened as expected with a cautious air from opening values given excellent planting weather for the month of April.  May corn collapses, trading lower, while oilshare finds its footing as traders buy soyoil/sell meal.  Traders buy wheat/sell corn as corn becomes the apparent sell leg of spread action today vs. wheat and beans.   Meal prices find some weakness on continuing concerns over ASF.  Reuters published an article quoting a source that sow stocks in northern China were 25-30% lower in the north from Feb. to March due to the latest outbreak of ASF.  &n...