The dove club has been plagued with pigweed. It's not too bad yet this year but it is showing up in some of the sunflowers. A couple years ago we had a work day and chopped as much down as possible with machetes and brush blades. That helped somewhat but it was pretty hard work.

What is a good herbicide that could be used to spot spray individual plants from a backpack sprayer? Seems like it would be better to kill it to the root and maybe have less problems next year.