THE OPEN May beans:  19 3/4 lower May meal:  3.30 lower May soyoil:  1.14 lower May corn:  6 lower May wheat:  10 3/4 lower The markets opened lower with prices under pressure as funds sold the open on weaker technicals and sharply lower outside markets.    Scale down pricing activity kept the sell-off at a more orderly pace for corn, but beans and soyoil prices were near session lows for most of the day. Grains held up better with more constructive export numbers.  Buy corn/sell bean and wheat trade helped corn to maintain a slower pace of market declines, though it ultimately set a new contract low. Adding insult to injury was another report that an ASF case was found in China as pigs were tr...