Posted 8/8/2006 08:59 (#33746 - in reply to #33671) Subject: That is what I would expect.
The competitive load for Giant Ragweed is high. A thin stand of Rags could easily get you the 4 to 5 bu drop.
Have you sprayed "clean" beans to see if you could measure a yield loss? I can't say that I have. May have spot sprayed an extra pass from time to time but I never had a chance to measure the loss on those passes. I am interested in your results.