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PGR + Cool Season Grass

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212K views 618 replies 130 participants last post by  ciprian.petre19  
#1 ·
The warm season folks have their thread, so should we start one for us cool seasoners?

FAQs

Q: When should I start applying PGR?
A: The general consensus is to start applying PGR after your 2nd mow of the season.

Q: Does the above apply if I recently renovated?
A: Yep!

Q: How often should I reapply my PGR?
A: A lot of folks use the GreenKeeer App to help them estimate when your PGR needs to be reapplied. The GreenKeeper App takes your location, grass type, application rate and climate/weather into account to make it's recommendations. If you don't want to use the GreenKeeper App, every 3 weeks is the suggested re-application cadence.

Q: How much PGR should I apply?
A: It is recommended that you start low and work your way up. For example, using a PGR with Trinexapac-ethyl 11.3% as the AI, start with 0.3 to 0.4 oz / M (1,000 SF). If that gives you the regulation you desire, stay there. If not, increase it slightly on the next application.

Q: Are there any risks associated with applying a PGR?
A: You betcha! For starters, if you apply too much your yard will look FUGLY until it wears off, and you might experience some die-off. Additionally, if your lawn has some sort of disease/fungus the PGR can prevent the disease from growing out as quickly as it would if it weren't under regulation.
 
#2 ·
I'll start with a q:

I'm planning to do my next PGR+ FAS this Thursday. Forecasted temps are in the upper 80s to perhaps 90. I think PGR is safe to apply at these temps (nothing is mentioned on the label), so my question is, what about FAS? Posts on other sites say to avoid FAS above 85. But why? Higher risk of burning?
 
#3 ·
Now that I've been using it for 2 years, PGR is one of the things I wouldn't do lawn care without. I apply 0.35oz/K trinexapac every 2 weeks, and the benefits I've noticed are:
- Slows down growth and reduces the amount of mowing needed. When I do mow, there's far less clippings.
- Increases density,
- Significantly enhances color.
- Reduces seed heads
- Increases root mass
- Does wonders for me as far as drought resistance through the summer.

It's a jug of magic :D
 
#4 ·
chrismar said:
I'll start with a q:

I'm planning to do my next PGR+ FAS this Thursday. Forecasted temps are in the upper 80s to perhaps 90. I think PGR is safe to apply at these temps (nothing is mentioned on the label), so my question is, what about FAS? Posts on other sites say to avoid FAS above 85. But why? Higher risk of burning?
Click to expand...
Yes, it can burn the grass. Having said that, you can spray it in the evening and do a quick rinse-off the following morning.
 
#12 ·
wardconnor said:
chrismar said:
...I'm planning to do my next PGR+ FAS this Thursday.....
Click to expand...
What is your FAS source and what are you using? Are you using MQ's formula? I want to start spraying iron but need more info for cool season turf. MQ said to use his formula at half strength. Anyone have experience with this?
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I recommend starting at half rate for Rye and TTTF as I don't know how sensitive they are. I would start there and work your way up to full strength.
 
#13 ·
wardconnor said:
What is your FAS source and what are you using? Are you using MQ's formula? I want to start spraying iron but need more info for cool season turf. MQ said to use his formula at half strength. Anyone have experience with this?
Click to expand...
I'm using powder/granular ferrous sulfate and ammonium sulfate obtained from ebay & amazon (respectively). I do 4 oz / K of ferrous sulfate and 3.4 oz / K of ammonium sulfate. This is the rate for KBG, I believe TTTF and mixes should use a lower rate.
 
#15 ·
Having done full strength applications last year, I actually recommend doing half rate apps every two weeks. With full apps you typically get about 3 weeks and then you have to spray again because it rebounds, whereas with half rate every 2 weeks you get 4 weeks of coverage on the same amount of PGR, so 30% more. The other advantage is if you overspray a spot at half rate, it's basically full rate, whereas if you over spray a spot at full rate it's double rate. The disadvantage is clear - for a 20 week growing season you're doing 10 rounds of spraying instead of 6-7 at full rate.
 
#16 ·
j4c11 said:
Having done full strength applications last year, I actually recommend doing half rate apps every two weeks. With full apps you typically get about 3 weeks and then you have to spray again because it rebounds, whereas with half rate every 2 weeks you get 4 weeks of coverage on the same amount of PGR, so 30% more. The other advantage is if you overspray a spot at half rate, it's basically full rate, whereas if you over spray a spot at full rate it's double rate. The disadvantage is clear - for a 20 week growing season you're doing 10 rounds of spraying instead of 6-7 at full rate.
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It's difficult enough as it is for me to get the 6-7 sprays in. Adding another 3-4 sprays increases the likelihood it won't get done.
 
#17 ·
I'm on T-Pac E-Pro MEC (Trinexapac-ethyl 11.3%).

Rates I'm using:
KBG - .6 oz/k
TTTF+KBG - .75 oz/k

I'm on a 3 week interval schedule and can definitely tell that it is working.

I'm debating on doing 1/2 rates going into Summer.
 
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#18 ·
What does anyone think about using Primo when establishing new grass? I'm planning to put down an app, if needed, on the reno to keep top growth under control so i can keep it mowed short. Would probably try an app after any bleaching from the tenacity post-m app wore off. Thoughts?
 
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#21 ·
Made my 2nd PGR+FAS app of the season. PGR was at .75 Oz/K since .60 Oz/K didn't seem to do all that much last time. I mucked up on my FAS calculation, though. Instead of 4 oz ferrous sulfate and 3.4 oz ammonium sulfate per K (gallon) I did 4/3.4 per 4k, so 1/4 of what I was supposed to do. Probably for the better considering the weather, but still bummed I won't get the full dose of the nice green up it provides.
 
L
#22 ·
Pete1313 said:
What does anyone think about using Primo when establishing new grass? I'm planning to put down an app, if needed, on the reno to keep top growth under control so i can keep it mowed short. Would probably try an app after any bleaching from the tenacity post-m app wore off. Thoughts?
Click to expand...
I had no ill effects on the small repairs I did using PGR on them this spring (KBG & PRG). If anything, it thickened them up faster.

I use T-Pac E-Pro MEC (Trinexapac-ethyl 11.3%) like ericg. I try to keep single apps at or under 0.5oz/K.
 
#23 ·
LIgrass said:
I had no ill effects on the small repairs I did using PGR on them this spring (KBG & PRG). If anything, it thickened them up faster.
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Awesome! Thanks for sharing! I am going to see how the renovation goes and try and work it into the plan in the fall. :thumbsup:
 
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#24 ·
Figure I'll share this here. It was a question I sent off to Syngenta in September 2015. I wondered why the label shows lower rates on shorter turf.

Pete1313 said:
I have a question about the application rates of primo maxx to Kentucky bluegrass. The label shows .6 fl oz/k for residential turf and .25 fl oz/k or fairways at .5" or less. My question is why the lesser rate on fairway heights? Is it because Primo maxx is more effective at lower heights of cut so less is needed to obtain the same results? Or is the turf at a lower height unable to handle a higher dose so less product sprayed more frequently is required? I'm currently maintaining Kentucky bluegrass between .75"-1.00" height of cut with primo applications at .6 fl oz/k every 3-4 weeks and looking to maintain it around .5" next year. Thanks for the support an great products!
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Syngenta said:
Hi Peter,

I consulted with a turf expert to answer your question. Here is the response:

Primo is generally more active on turf mowed at lower heights. The primary reason is thought to be at lower mowing heights, there is less leaf tissue to intercept the spray, so more product penetrates into the canopy and reaches the growing point. If he is bringing his mowing heights down to 0.5" next year, we would suggest starting at 0.25 oz per 1000 for 2 applications on 3 week intervals, then increase to 0.4 oz and adjust up or down from there.

Thank you for asking and have a great day!

Teresa

__________________________

Teresa Acosta
Resource Rep
Technical Services
Syngenta
Click to expand...
 
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