Use a pre-emergent twice a year.  Usually in March and late September.     Don’t put down a pre-emergent in the fall on the fields you are going to overseed unless the label states that you can !!  Princep or Simazine are 2.

You’ll usually have to do post-emergent treatments on a variety of weeds.  The grassy weeds can be controlled with MSMA, which you’ll have to use a couple of times 7 days apart when the temperature is 80 degrees all day and night. Revolver is a new chemical for grassy weeds.  It will kill most grassy weeds.  The broadleaf weeds can be controlled with Trimec Plus or Trimec Southern as necessary.

These chemicals are just names that I know.  This is not an endorsement.  My suggestion is to have your chemical salesman set up a schedule for your price range and use the products that he knows will work in your area and that he has had experience with.  This is a good way to work as then the salesman is directly involved with the weed killing on your fields and this usually ensures that he will make sure his chemicals work and that your school is in compliance with the state laws that he has to be in compliance with.

Remember, you’ll always have weeds no matter what you do !  The best way to keep them out is to grow thick grass and even then you’ll have a few.  All chemicals will slow or stunt the grass a certain amount so be careful with the timing of applications, temperature, sunshine, moisture and time of day.  The best you can hope for is to be able to treat patches of weeds with just a hand sprayer and that will probably take at least two years of work.