A lot of research has been conducted to demonstrate effective weed management in a proactive way. According to Dr. David Shaw, Chair of the Task Force on Herbicide Resistance Education, diversification is the key to resistance management.
Once you have the RealPlayer installed, click one of the two speeds listed to start playing the file. If your connection is less than 56K (28.8 or 33.6), you should choose the 28K file. If your connection is 56K or higher, choose the 56K file.