My alfalfa field is in its third year and has never been sprayed. However, I have noticed that some type of grass seems to be migrating from my neighbors field into mine! I also have a lot of bindweed and Chinese lettuce in my first cutting. We also have lot of dodder, which is a weird, yellow, stringy looking, parisitic plant. Most farmers in my area use Velpar but I have heard good things about 2-4db and have a sprayer that I would like to use. Any thoughts?