Absolutely, there are too many market forces in play too trade just based on following a chart. Especially when you want to buy and sell on a daily base, trying to beat the chart.
But This chart is showing almost two years of PEIX, oil, ethanol and corn. And I think it is possible to notice some connections. The most obvious imo is the connection between the oil price and PEIX. PEIX seems to follow the line of oil most of the times. Yes, the charts aren't completely syncronised timewise it may be a few days to weeks off, but you can see peix follows the pops and drops in oil.
In the beginning of the chart PEIX seems to follow ethanol a bit more, but later on PEIX seems almost completely detached from the ethanol movement if you look at the larger picture.
I did put the start and end quote of peix an oil in line to see the connection better and it really surprised me how much they look alike.