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Dollar spot treatment plan and prevention moving forward

6.9K views 3 replies 4 participants last post by  440mag  
#1 ·
Central Jersey, zone 7a. I've observed dollar spot now for a 3rd consecutive year. To my knowledge I never had it prior to the 2020 growing season, though I've also become much more observant over the years and know to be on the lookout for fungal issues.

The first year (2020), I just let it ride, and tried (unsuccessfully) to fertilize and grow my way out of the problem. It did not work. I had small patches of dead turf / bald spots all over the place by the end of Summer.

Last year (2021), I reluctantly sprayed the bayer fungus hose end product (propiconazole) at the curative rate after dollar spot became evident (early-mid June). Fortunately, it worked. I didn't even have to do a second application, it completely wiped out the infestation in one application. I was thrilled.

My hope entering this year (2022) was that it would not return since I had such good success treating it last year, however, I started observing the typical small patches right around the first week of June. I just yesterday applied the bayer propiconazole hose end sprayer product to combat the issue and I am hoping for results like last year.

That being said, I am paranoid about building up resistance to propiconazole, so I wanted to ask what I can rotate the propiconazole treatments with in the future if I have to spray again this year or in the future. As an example, my understanding is azoxystrobin - does not - work for dollar spot. I'd like to know what brands of products you recommend / have had success with against dollar spot in the past.

I was reluctant to preemptively spray, but I'm beginning to accept it will need to be done on an annual basis moving forward. My rationale is, I can't have an outbreak of DS ruin all the hard work in an otherwise healthy turf stand. I just want to do the treatments in the safest / recommended best practice moving forward.
 
#3 ·
I've generally used clearys 3336 dg lite which is a group 1 to rotate but I also have a smaller area that I do fungicide treatments (~2k). I do not treat my backyward (8k).

My primary go to is Headway G (prop and azoxy) as group 3/11 combo and according to the label you can do two successive treatments without rotation. The label recommends Daconil as a rotation treatment but all the labels I have read for that state it is not for use on residential lawns, hence the clearys.

Based on your profile though it seems like you have like 10k lawn size? So those granulars will be prohibitively expensive. I am a granular guy but no doubt the liquid route is ultimately cheaper if you run the numbers (Generally).

If you generally notice the dollar spot starting same time of year, maybe look to start with a preventative application earlier?
The gdd tracker is useful but I also like the model below, type in your zip code and you can get a feel for when the first sustained risk of dollar spot might be approaching in your area.

https://www.greencastonline.com/dollar-spot-solutions
 
#4 ·
critterdude311 said:
…I reluctantly sprayed …
Can't say I blame you but unfortunately, dollar spot is one of the fungi that calls for whatever the opposite of reluctance is … as you've discerned …

critterdude311 said:
… I am paranoid about building up resistance to propiconazole,
The TLF Fungicides Guide linked up thread is your best friend.

^That^ said, gitchyewsum "Armada." And be prepared to be impressed!

critterdude311 said:
… I'm beginning to accept it will need to be done on an annual basis moving forward. I just want to do the treatments in the safest / recommended best practice moving forward.
Sounds like same metamorphosis I went through. And, kudos to you for pursuing best practices (instead of the "easy" or "cheap" way out!) :thumbup:

jedross86 said:
Check out the fungicide guide: https://thelawnforum.com/viewtopic.php?f=9&t=4042

You'll want to rotate fungicides to avoid resistance build up. For DS you'll probably want to introduce something in FRAC group 1.
^Two points which simply cannot be stressed enough or, too often …

MachoManMooch said:
…
My primary go to is Headway G (prop and azoxy) as group 3/11 combo and according to the label you can do two successive treatments without rotation. The label recommends Daconil as a rotation treatment but all the labels I have read for that state it is not for use on residential lawns, hence the clearys.
I had the same thought until I noticed need / desire to decrease reliance on prop (which Headway contains) so, my go to in OP's scenario is hands down, "Armada" :thumbup:

Active Ingredients: Trifloxystrobin 8.33% , Triadimefon 41.67%
Fungicide Mode of Action: 3 + 11

MachoManMooch said:
…If you generally notice the dollar spot starting same time of year, maybe look to start with a preventative application earlier?
The gdd tracker is useful but I also like the model below, type in your zip code and you can get a feel for when the first sustained risk of dollar spot might be approaching in your area.

https://www.greencastonline.com/dollar-spot-solutions
^Excellent advice^ and as much as I procrastinated my fungal disease outbreaks were never even approaching "under control" until I bit the bullet and went preventative.

OP, it took some time (maybe a pot of coffee?) but, using the TLF Fungicides Guide I was able to come up with an annual preventative rotation that avoids any resistance danger for the most bang for the buck. I'm now going on 5 years with essentially zero fungal outbreaks in my established turf (I did have a Pythium outbreak in a newly seeded area in '19 I think but, that was an outlier event.

I posted my current rotation in this thread: https://thelawnforum.com/viewtopic.php?f=31&t=34855&p=486566&hilit=Rotation#p486566

Definitely "shop around;" however: IIRC, last time I restocked, this was lowest price point I found for Armada, shipped to my door … https://www.forestrydistributing.com/armada-50-wdg-broad-spectrum-fungicide-bayer

It foams a bit so I typically mix it with approx. 1.5 to 2 gal.s water in old 2-1/2 gal jugs, shake the bejeebers out of it, and then transfer the dilution to my 4 gal sprayer and add the remaining several gal.s of water with a bucket … and spray immediately.