Its possible that every other China bound shipment of lettuce, beans, asparagus, or whatever "will be tainted with _______" (fill in the blank here with whatever plant problem you can make up)
We already have that ongoing concern with the NAFTA trading partners. It's a tough nut. Either you stop all international trade, or you send inspectors to the ports to reject all non-compliant imports - making the standards either ridiculous or ridiculously unattainable. Remember the US rice that was legally condemned by Japanese inspectors because it wasn't refrigerated?
Whether any civilized nation should be doing business with China or not is a seperate issue. If you're gonna do business, it should be done in an honest and forthright manner. I imagine the European regulators are in a major fingerpointing swivet trying to explain the bad will shown to their Chinese trading partners.