Don't do it.
Typically, you would use one sprayer for herbicides and another for fungicides/pesticides.
All sorts of chemical reactions can occur by mixing chemicals in a sealed container. However, you may read the directions and see if it is recommended to mix what you are using. Check both labels and compare active ingredients.
Waiting a few days between applications should be fine.



Yeah, I'm thinking if they were safe to mix, you'd be able to buy it somewhere

