Long term weed control for me is in the shape of a pre-emergent. It works to stop seeds germinating, and in the 3 years I have used a Prodiamine based spray I have not had an issue.
You can buy from an Aust supplier and get say 1L of 48% for over $200 a bottle, or look online for options. I bought a 2.5kg container at 65% strength for close to $150 - far more economical and I have a healthy stock that I have shared to family etc.
My application rate is 12g in 5L sprayer per 100m and then water in with a half inch. I do that 3 times a year and I just don't get weeds any more. Works for me on Poa, crab grass, bindii, broadleaf.
Right now is the time to spray before it warms up and those dormant seeds reach for life above ground.
Cheers,
TC.
