Agrichemical giant Monsanto ( MON) is another name that's looking toxic to your portfolio. Monsanto is effectively flat on the year, after dancing around in a pretty narrow range since the beginning of January. With shares popping out of the downside of that range, investors should brace themselves for more downside from MON. >>5 Big Stocks With Insider Buying Monsanto spent the last few months forming a descending triangle pattern, a price setup formed by downtrending resistance to the upside and horizontal support below shares at $98. Basically, as MON bounced in between those two technically-important price levels, it was getting squeezed closer and closer to a breakdown below $98 support. When that happened at the start of this month, we got an initial sell signal. More recently, a consolidation right underneath newfound resistance is giving traders a second chance to exit shares. Small consolidations -- or even retracements back to previous support -- aren't uncommon after technically significant moves. In fact, they're typically seen as confirming moves, since MON's pop back up to $98 verified to sellers that the stock was now unable to catch a bid at higher levels. If you haven't already sold MON in 2013, now's your chance.