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CenlaLowell
UMass Fan
Alexandria, la
Member since Apr 2016
301 posts

re: Is it time for pre emergent in South LA?
Some herbicides are too expensive for this waste. Cut your yard the next morning spray. If using NIS herbicides are took up in about 12-24 hours, but products like Celsius takes 2-3 weeks for final results


CenlaLowell
UMass Fan
Alexandria, la
Member since Apr 2016
301 posts

re: Is it time for pre emergent in South LA?
MSM TURF is a better product for buttonweed in imk


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CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1270 posts

re: Is it time for pre emergent in South LA?
quote:

Some herbicides are too expensive for this waste.

Are you referring to the costs per application of using granular vs spay pre-emergent herbicide? Certainly everyone should consider this when choosing a granular vs spray. - it’s certainly easy to calculate the cost per application for each and then decide.

I’ll be using Specticle pre-emergent herbicide for the first time this April/May to deal largely doveweed issues, that prodiamine or dithiopyr don’t control. It’s a very pricey herbicide, and you can purchase it as liquid/spray or granular product. My quick calculation of spray vs granular per application shows it much cheaper per application to use the spray, so that’s what I will do, b/c of its high cost.

The other thing that one must consider for the home user in cost per application, is that often spray pre-emergents may be sold only in larger containers - Simazine for example, the smallest container is 2.5 gallons but one uses a very small quantity per application. That’s OK as long as the herbicide has a very long shelf life, Simazine does. But if you purchase a herbicide with a much shorter shelf life and one has to replace it before you use it up b/c it’s efficacy has deteriorated over time sitting on the shelf waiting to be used, then perhaps the cost savings may not be realized.

Just something to consider when choosing the product.


meeple
USA Fan
Member since May 2011
6335 posts

re: Is it time for pre emergent in South LA?
Supposed to thunderstorm tomorrow and rain thursday. Then a break until next week until more rain.

Should I put out prodiamine (spray) tonight before tomorrow's thunderstorm, risking it washing some out, or put it out on an already-saturated ground in between tomorrow's storms and thursday's rain, or wait until friday/saturday after the ground has a chance to dry out some?

My 5-day average soil temps are sitting at 54 deg currently.
This post was edited on 2/4 at 4:14 pm


Drunken Crawfish
USA Fan
Crushing 'skis at Tobin's house
Member since Apr 2017
2392 posts
 Online 

re: Is it time for pre emergent in South LA?
If its a granular I'd think it would be fine to out out today. I think the rain is supposed to move in later tonight/early morning tomorrow so I would be a little wary of putting out spray.


meeple
USA Fan
Member since May 2011
6335 posts

re: Is it time for pre emergent in South LA?
Yeah it's spray


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CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1270 posts

re: Is it time for pre emergent in South LA?
quote:

If its a granular I'd think it would be fine to out out today. I think the rain is supposed to move in later tonight/early morning tomorrow so I would be a little wary of putting out spray.

I’d agree with the granular, and less sure about the spray in regards to the possible herbicide run off with a true heavy thunderstorm. Will need to be a judgement call.

I put out prodiamine and dithiopyr this morning in anticipation of rain tomorrow to water it in, but both were granular.


meeple
USA Fan
Member since May 2011
6335 posts

re: Is it time for pre emergent in South LA?
Ok, i'll wait a couple of days after it is finished raining, then put it down and manually water it in


LSUDbrous90
LSU Fan
Lafayette
Member since Dec 2011
1032 posts

re: Is it time for pre emergent in South LA?
So I put down pre and post emergent today. Is it okay that I put both of them + suffercant + water together to spray the whole yard? Also how the hell do I clean out my sprayer? Its stained yellow from the prodiamine.


CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1270 posts

re: Is it time for pre emergent in South LA?
Putting down both is fine. Cleaning your sprayer - just dedicate that sprayer to herbicide use, and get another for other uses.


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Bryant91092
Alabama Fan
Member since Dec 2009
21482 posts

re: Is it time for pre emergent in South LA?
Do you have a granular post emergent brand you’d recommend?


CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1270 posts

re: Is it time for pre emergent in South LA?
quote:

Do you have a granular post emergent brand you’d recommend?

Well, I have been using LESCO granular Dimension 0-0-7 (dithiopyr) with good success, and b/c so many on this board use Prodiamine I thought I’d try it so I purchased granular LESCO Stonewall 0-0-7 (prodiamine) and I applied granular Dimension in my front yard, and granular Prodiamine in my backyard a few days ago.

Dimension is particularly effective against crabgrass (and of course numerous other weeds) and will even kill young crabgrass, up to the 3 leaf stage, and to my knowledge prodiamine will not kill crabgrass after it germinates. I had a serious issue with crabgrass in my front yard 3 years ago, I eliminated it using Dimension in one year.

The granular Prodiamine was cheaper per 50 lb bag than the granular Dimension but the application rate is 8 lbs/1000 sq ft for Prodiamine and and granular Dimension 4 lbs/1000 sq ft, so cost per 1000 sq ft was cheaper for the Dimension. I’m trying to recall from memory, but I think the Dimension was about $34 per 50 lb bag and the Prodiamine about $22 per 50 lb bag.

Now, for the spray versions, which I have not used - yet, the prodiamine is cheaper per 1000 sq ft.

Sorry for the long answer for a simple question, but both these pre-emergents will provide you with very good results so you can’t go wrong using either, but if by chance you have a crabgrass issue, I’d recommend the Dimension.



tigerlife36
Member since Sep 2016
430 posts

re: Is it time for pre emergent in South LA?
I'm using prodiamine wdg and was wondering if anyone has done split apps? I used a calculator online and used the 6 month control rate amount. Would split app refer to 6 months for now or are some people applying half rate now and a few months later applying again? Just seems like a lot of extra work if you're applying the right amount to take care of crabgrass germination in the spring.


Bryant91092
Alabama Fan
Member since Dec 2009
21482 posts

re: Is it time for pre emergent in South LA?
I’ve been googling but can only find the pre emergent and not post emergent for what you were recommending above.


Antib551
Houma, LA
Member since Dec 2018
16 posts

re: Is it time for pre emergent in South LA?
You can do true split apps but I would supplement with another pre-em. I currently split the max yearly rate of prodiamine into four different applications.

Spring(now) 1/4 yearly max prodiamine + simazine
10 weeks later 1/4 yearly max prodiamine
Octoberish 1/4 max prodiamine + simazine
10 weeks later 1/4 prodiamine

But you could do "split apps" of prodiamine of 1/2 yearly max in spring and fall


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meeple
USA Fan
Member since May 2011
6335 posts

re: Is it time for pre emergent in South LA?
quote:

Would split app refer to 6 months for now or are some people applying half rate now and a few months later applying again?

I follow this plan at the link below. 1/2 of the yearly total split into two apps in the spring, and the other half in a single application in the fall.

LINK


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CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1270 posts

re: Is it time for pre emergent in South LA?
quote:

I’ve been googling but can only find the pre emergent and not post emergent for what you were recommending above.

My bad - I read your question as pre- and not post. What type of grass?

I’ve not used granular post-herbicides so I just don’t have much familiarization with them. I suppose the most common granular post-emergents would be those containing Atrazine but you might be restricted to a Weed & Feed product containing Atrazine., something like this. LINK

Also you could apply this granular “trimec” post emergent which would also be suitable for application now. Fertilome Weed Out Broadleaf Control. but I see it’s not labeled for St Augustine. Not sure why b/c trimec herbicides in spray form are labeled for St Aug.

I suppose if I had to use a granular post-emergent herbicide, I’d apply Fertilome Weed Out broadleaf Control now, and after I mowed my lawn twice and had active grass growth I’d use a Weed & Feed product containing Atrazine. This assumes a Centipede Lawn not Bermudagrass or St Augustine.

You are really better off, cost wise and option wise, using spray post-emergents.


Bryant91092
Alabama Fan
Member since Dec 2009
21482 posts

re: Is it time for pre emergent in South LA?
My yard is primarily bermudagrass. Thanks for the help.


tigerfan5959
LSU Fan
Member since Jun 2010
249 posts

re: Is it time for pre emergent in South LA?
I put down some prodiamine today . When should I apply a post emergent? I see my Poa annua and some other weeds in my yard already.


CrawDude
LSU Fan
Baton Rouge
Member since Apr 2019
1270 posts

re: Is it time for pre emergent in South LA?
quote:

My yard is primarily bermudagrass. Thanks for the help

Well then I think the granular Fertilome Weed Out Broadleaf would work for you now provided the remainder of your lawn is not St Augustine. I’m still puzzled why this product is not labeled for use on St Augustine as it contains the same three “trimec” herbicides labeled for use on St Augustine in the liquid spray versions and which I use routinely on the St Aug in my backyard. I suspect concentration of the herbicide - I’ll need to research this.

You can’t use Atrazine on actively growing Bermudagrass, you can if it is dormant, but then that defeats the purpose of using a Weed & Feed product containing Atrazine. One does not, should not, fertilize dormant lawns. But there are some weed and feed fertilizers containing trimec herbicide you can use after you mow your lawn twice. Just check vendors that carry a good variety of fertilizer products.


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