Monsanto ( MON) reports earnings on Wednesday and analysts are looking for 80 cents a share, which is about half of the estimate from three months ago and down 40% from estimates from a month earlier. Generic competition for its Round-Up weed killer, plus increased natural resistance to the formula, has hit the company this year. Monsanto's stock performance has been negative all year long, leading to a 40% drop in shares. MOO hasn't fared much better, having performed weakly all year before turning negative in late April. MOO is well above its lows from 2009, unlike Monsanto, which is at new lows, but shares still look weak.