By Harold Watters, Ohio State University Extension agronomist
Once again your county Extension professionals went to the fields this fall to see what weeds made it through the summer in your soybean fields. There were some surprises and some expected results. It is becoming apparent that with the move to herbicide tolerant crops, we aren’t necessarily getting rid of all of our weeds — only 30% of our fields are weed free. Giant ragweed moved back into first place for worst weed, seen in 34% of fields and overtaking marestail seen in 30% of fields. Volunteer corn is next most common, and it always surprises farmers that a herbicide resistant crop would also resist the same herbicide when it volunteers the next year. Please look over the tables to see if there are familiar names on your worst weed list.
|Weed||Ohio rank||% of fields|
|Grass/ Giant foxtail||5||15|
I split up the state into regions — the areas of northwest and west central Ohio had the weediest fields, — as they have in the recent past.