Group 3 fungicides like Propiconazole and Triticonazole have two notable potential problems. First is that they are growth regulators. I assume at higher doses that the growth regulation is more. That is not usually a problem unless you are applying in conjunction with other growth regulators like Primo.

The second, more problematic issue for you, is that they can cause turf injury at high doses and when applied at higher temperatures. It seems to be more of a concern with Bentgrass and Bermudagrass, and I use Propiconazole in high temps on Bluegrass with minimal issues, but there is a dose dependence. The injury isn't from contact, but can show up any time the fungicide is in the plant and temperatures rise. There isn't much you can do now, but be aware that thinning and chlorosis for the next few weeks may be in part from the DMI fungicide.

I'm guessing you aren't the first person to do this, so hopefully someone with more direct experience will jump in.

Also, keep us updated as you won't be the last person to do this.

 

I did this exact same thing Sunday with Headway G. I used the spreader setting on the label and for whatever reason it was way to heavy. Probably still my fault. Like you said the learning continues.

 

What can I expect to happen to the grass?

Nothing, most likely. The rates on bagged products are typically fairly conservative, and sometimes the rates double for curative apps.

 

I did this exact same thing Sunday with Headway G. I used the spreader setting on the label and for whatever reason it was way to heavy. Probably still my fault. Like you said the learning continues.

Same thing happened to me today. Accidently spread 6lbs/1K instead of the 2lb rate even though I was following the spreader setting listed on the label. Have you seen any issues yet?

 

No issues yet but I just applied it Sunday and it really didn't get watered in until last night. I'm looking at it as if I applied at a heavy curative rate. I'm more upset that I had to skip parts of the yard. However that should show me if it worked or not.

 

You will be fine. Too much herbicide or fertilizer (like urea) is a problem. No problem on the over app of fungicide.

 

Here is the update:

No problem from the fungicide.

All is well!

 

Same here.

 

Same here.

nice :thumbup: thanks for update. Too few people come back to tell us what happened.