[Killsocket]

Is there such a thing as herbicide burn that looks like this?

Last week, I put down big box store weed/crabgrass killer per label instructions as well as some fungucide, but the fungucide was applied only in spots where I do have powdery mildew, and this discoloration is present in areas where I did not apply the fungucide. Nothing else has touched this lawn in weeks other than rain.
I keep a lawn journal and the week killer was applied at 7:30PM with 75* weather.

Or is this just another problem (fungus?) in my lawn now.... I am having all sorts of issues at 4" cut.

 

[Powhatan]

This identification didn't help?
https://thelawnforum.com/viewtopic.php?f=9&t=3551&p=65880#p65889

 

[Killsocket]

Wow. This is just kind of blowing up on me. I am still wrapping my head around all this. Sorry for the questions. I just am a little overwhelmed. Looks like I got some work to do! Thanks for pointing out what I already should have known!

 

[Killsocket]

This identification didn't help?
https://thelawnforum.com/viewtopic.php?f=9&t=3551&p=65880#p65889

I've read label after label. I did some EAGLE 20EW a few days ago (mostly for powdery mildew, but thankfully the active ingredient controls leaf spot I read when I googled helminthosporium on U of Wisconsin - extension). I plan to do another Eagle 20EW lawn wide for a second app after the recommended number of days pass. I've read about a fungus becoming resistant to treatment and read that the third app should be something different (group number?).

So, based on 10K lawn, I would like to use Heritiage G but I think Scotts Disease Ex (I believe same active ingredient minus propiconazole) is slightly more cost effective and has great reviews (plus some testimonials on this forum). Is this a decent product to use to alternate with to avoid resistance?

COULD I put down Disease Ex now (the Eagle 20EW app was more of a spot treatment)?

Sorry about all the questions, but I am really trying to research the best I can before I ask.

 

[Powhatan]

I don't have a lot of experience with fungicides, only started this year with the new lawn. I've only used two granular preventative rate treatments 3 to 4 weeks apart, Scotts DiseaseEX and Bayer Advanced Fungus Control. I've also been mowing my lawn just a bit tad low @ 3.25" to help with air flow, and I don't irrigate only rain fall for watering. The fungal pressure on my lawn has been random widespread, but minimal, probably due to the previous described actions I've taken.

I think it would be safe to put down another granular treatment about 3 weeks if doing preventative application. Also, I believe most control applications are 7 to 14 days apart. If I'm wrong, hopefully someone else will chime in and supply a better recommendation.

 

[Suburban Jungle Life]

Go ahead and put down the scotts now. If you used the eagle as a curative but only spot treatment, you can use a different fungicide with a different moa. If you feel the problem is under control with your spot treatment, use the scotts at 2 lb/M for 28 days (2 bags for 10k lawn). That is the preventative rate. If it doesn't look like the spot treatment worked, use scotts at 4 lb/M for 14 days (curative rate, 4 bags for 10k).

Propiconazole is group 3.
Myclobutanil is group 3.
Azoxystrobin is group 11.

Is it a good idea after 2 to 3 applications to switch to a different moa so fungus doesn't become resistant or a resistant strain doesn't spread. You can always combine multiple fungicides for a strong application and reduced risk of resistance. Some products have up to 4 different fungicides in them.

 

[Killsocket]

Thanks. I think I will put down Scott's now at a curative rate. Wait the amount days of the label to see how lawn responds.
Then maybe another dose of Eagle if problem still persists.