Burning lawn

[dwyman]

I have a couple questions. A couple weeks ago I did a granular app and spot sprayed for weeds for the first time on a new account. I drove by the following week and noticed brown spots in the grass on all the spots I had sprayed. The temp that day was 81 and low 80's for 3 days previous. I did everything according to label directions. I didn't spray above 85 deg and mixed according to specs. This batch had Drive and Trimec combined but hadn't bothered any other lawns I sprayed. Any ideas why it may have done this. I am somewhat new to chem apps so any tips would be greatly appreciated.

For you guys that have been around a while: Do you just need one day of under 85 deg to spray or should you wait until you have a series of them? I guess I'm concerned about spraying a stressed lawn. So how do you define a stressed lawn?

Do you spray in the heat of the summer or just wait for early fall?

[Ric]

We can only second guess what might of gone wrong. Did you keep the tank mixed or let it settle out. Could be that one lawn got a stronger AI. and was burned.

As far as stressed laws go, a good strong green color is generally a healthy lawn. Any thing short of that would be a candidate for stress.

[dwyman]

It's possible I may not have shaken the sprayer before spraying this one. Anything is possible.