iPath Dow Jones UBS Coffee Subindex Total Return ETN ( JO) -2.7% Coffee prices are tumbling, leading JO to suffer its fifth consecutive day of declines. The ETN's string of losses has pushed it to its 200-day moving average for the first time since this time last year. On the opposite side of the spectrum, sugar prices are heading higher, pushing the iPath Dow Jones UBS Sugar Subindex Total Return ETN ( SGG) to industry-leading gains. Trying to game individual crops can be a risky endeavor. The broad based PowerShares DB Agriculture Fund ( DBA) is a better option. In early afternoon trading, the fund was in positive territory. All prices as of 2:15 PM EST Written by Don Dion in Williamstown, Mass.