The challenges with the DBA are (#1) what it includes for an "agriculture" focused ETF, and (#2) its weighting of those components.
Non-DBA specific challenge of advancing dollar strength further complicates price predictions for any commodity priced primarily in dollars.
DBA does show the drop acceleration versus the dollar appreciation that July brought.
Also the recent breakdown was accompanied by slight increase in volume.Next support area is 24-24,5$ 1/4/15