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reauxl tigers
Chicago Cubs Fan
Baton Rouge
Member since Aug 2014
1050 posts
 Online 

Is it too late to put pre-emergent herbicide down?
In granular form? I know the recommended window is late October through November but would it be a waste of time and money to put it down now?
This post was edited on 1/11 at 2:27 pm


LSUballs
LSU Fan
RayVegas LA
Member since Feb 2008
31051 posts

re: Is it too late to put pre-emergent herbicide down?
I think if the weeds you’re trying to kill haven’t emerged you’ll be fine. If they have, go with a post emerge.


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prostyleoffensetime
USA Fan
Mississippi
Member since Aug 2009
8650 posts

re: Is it too late to put pre-emergent herbicide down?
Do you have anything currently alive? What are you trying to keep from emerging?


Easternrio
LSU Fan
Member since May 2014
3755 posts
 Online 

re: Is it too late to put pre-emergent herbicide down?
You’re not far from needing to put pre emergents down for spring/summer weeds.


prostyleoffensetime
USA Fan
Mississippi
Member since Aug 2009
8650 posts

re: Is it too late to put pre-emergent herbicide down?
Yeah, I know. Probably going to nuke my yard next week while I don't have much going on at work... Always put it on the back burner when I start to get busy.


Theboot32
LSU Fan
Member since Jan 2016
1764 posts

re: Is it too late to put pre-emergent herbicide down?
What do you recommend for st Aug? I've had that Virginia buttonweed like crazy the last couple years, would love to stop that shit


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tigerinthebueche
LSU Fan
Erwinville, LA.
Member since Oct 2010
19829 posts

re: Is it too late to put pre-emergent herbicide down?
I sprayed 2-4-D today on a few pastures. Supposed to be above 65F before you spray but I said frick it. Hope I didn’t waste my time.

That said, it’s gonna be cold next week. Mind the recommended temp application guidelines before you put anything out.


LSUlefty
LSU Fan
Youngsville, LA
Member since Dec 2007
19554 posts

re: Is it too late to put pre-emergent herbicide down?
I have a clover problem right now.


TygerB8
LSU Fan
Youngsville
Member since Jul 2005
942 posts

re: Is it too late to put pre-emergent herbicide down?
Same here (also in Youngsville area). I went to Chastant Bros and they recommended "Weed Free Zone". Used it about a day ago....we'll see if it works.


LSUlefty
LSU Fan
Youngsville, LA
Member since Dec 2007
19554 posts

re: Is it too late to put pre-emergent herbicide down?
Let me know if it does.


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prostyleoffensetime
USA Fan
Mississippi
Member since Aug 2009
8650 posts

re: Is it too late to put pre-emergent herbicide down?
What’s the deal with 65°? Is that for protecting grass or making sure the 2-4,D is working? I’ve sprayed it when it was like high 30’s temps on land I was going to plant corn on and it did a jam up job. Like most herbicides, it’s just a little slow when it’s cold in my experience.


stewie
Central Florida Fan
Member since Jan 2006
3247 posts

re: Is it too late to put pre-emergent herbicide down?
quote:

What’s the deal with 65°? Is that for protecting grass or making sure the 2-4,D is working?


I’m guessing their recommendation is twofold.

One, the colder the temps, the longer the reaction time. 2-4,D usually reacts pretty quickly but cold temps could take a bit longer. During winter months, I’d just suggest that you spray with a 48 hr window of no rain or heavy fog.

Two, the surface inversion has usually lifted out of the way by the time the temps hit 65 degrees (not always but usually). What you doesn’t want to do is spray and have the chemical drift floating around in a suspension and land on off target areas.
If you spray with warmer than 65 degrees, there’s a much higher likelihood that the smaller drift particles will safely land in the target area.

Unless you grossly over apply, 2,4-D won’t impact your grasses at this point in the year.


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stewie
Central Florida Fan
Member since Jan 2006
3247 posts

re: Is it too late to put pre-emergent herbicide down?
Additionally,

Here is a link to NOAA’s fire weather forecast and it has a surface inversion lift temperature (SILT) listed. To be in the safe side, spray after the temps are above the listed SILT for your area.

NOAA fire weather forecast


It’s also a great general weather resource.


whatchamacallit
LSU Fan
Moulin Rouge
Member since Nov 2012
259 posts

re: Is it too late to put pre-emergent herbicide down?
Lol, it looks like greek to me... but I ain't won no MacArthur grants either...
This post was edited on 1/12 at 11:00 am


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tigerinthebueche
LSU Fan
Erwinville, LA.
Member since Oct 2010
19829 posts

re: Is it too late to put pre-emergent herbicide down?
From what I’ve read, plants metabolize it better at 65F and above. Whatever that cabbage looking shite is in my pastures, it was curling up this morning so I guess they were metabolizing yesterday.


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reauxl tigers
Chicago Cubs Fan
Baton Rouge
Member since Aug 2014
1050 posts
 Online 

re: Is it too late to put pre-emergent herbicide down?
quote:

I have a clover problem right now.
Thats been my main issue for years. It keeps coming back in the exact same spots every year even though I hit it a few times a year with 2-4-d and a pre emergent in spring. Can't seem to make it go away forever.


prostyleoffensetime
USA Fan
Mississippi
Member since Aug 2009
8650 posts

re: Is it too late to put pre-emergent herbicide down?
Maybe try a fall pre-emerge.


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