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What's the recommended fall pre-emergent?
Posted on 10/15/24 at 5:28 pm
Posted on 10/15/24 at 5:28 pm
I have a large yard and no big sprayer so I'd rather a granule form if it exists. I want to ensure as few weeds as possible in the spring so what can I use and can I put it out now or should I wait?
4
Posted on 10/15/24 at 8:13 pm to TDsngumbo
I don’t think I’m exaggerating when I say that today was the perfect day to put it down, and tomorrow is damn near cutting it too close.
I sprayed Simazine today, but for a granular, just get some Prodiamine.
Very important that you get it done tomorrow AND water it in tomorrow.
Why? 53° tonight and 46° tomorrow. The soil will be very active for winter weeds that germinate below 70° soil temps. The good news is it should take them a few days to a week to sprout so get that weed barrier into the soil asap.
which is all a pre emergent is—a chemical barrier that seeds can’t penetrate.
*I wrote this post for general information purposes to whoever it may benefit*
I sprayed Simazine today, but for a granular, just get some Prodiamine.
Very important that you get it done tomorrow AND water it in tomorrow.
Why? 53° tonight and 46° tomorrow. The soil will be very active for winter weeds that germinate below 70° soil temps. The good news is it should take them a few days to a week to sprout so get that weed barrier into the soil asap.
which is all a pre emergent is—a chemical barrier that seeds can’t penetrate.
*I wrote this post for general information purposes to whoever it may benefit*
Posted on 10/15/24 at 8:25 pm to TDsngumbo
Hi-Yield dimension
This post was edited on 10/15/24 at 8:26 pm
Posted on 10/15/24 at 8:42 pm to bayoubengals88
Soil Temps
So if the current soil temp for my area is 77 degrees it's best to wait until it's closer to 70?
So if the current soil temp for my area is 77 degrees it's best to wait until it's closer to 70?
Posted on 10/15/24 at 9:00 pm to Lazy But Talented
Use the custom date range tool.
Soil temps are projected to be 61° by 10/17 based on much lower air temps starting right now. We get down to 53 by tomorrow morning and 46 the next.
Soil temps are projected to be 61° by 10/17 based on much lower air temps starting right now. We get down to 53 by tomorrow morning and 46 the next.
Posted on 10/16/24 at 4:44 am to TDsngumbo
Specticle g. Expensive, but the best.
Posted on 10/16/24 at 8:08 am to bayoubengals88
quote:
I don’t think I’m exaggerating when I say that today was the perfect day to put it down, and tomorrow is damn near cutting it too close.
I’m in New Orleans and 5 day average is still around 75. That said, I will be putting Prodiamine down today.
I just ordered Simazine as well and want to do a split application. Would it be best to do Prodiamine applied at half rate today, then follow up with Simazine at half rate in 2 weeks?
Posted on 10/16/24 at 8:33 am to jordan21210
quote:Sounds good to me, but Ronk would know better with split apps.
Would it be best to do Prodiamine applied at half rate today, then follow up with Simazine at half rate in 2 weeks?
Posted on 10/16/24 at 11:14 am to jordan21210
quote:Good idea to put down today, wouldn’t be terrible if you can’t do it today. Often times people say pre-emergents stop the seeds from germinating, which is false - it’s just easier to say it that way.
I’m in New Orleans and 5 day average is still around 75. That said, I will be putting Prodiamine down today.
Germination is basically the seed expanding and breaking out of its shell under the right conditions, which is why soil temps matter, not air temps. After germination happens, the seed will send out its roots which absorb nutrients in the soil. It’s at this point that it absorbs the pre-emergent and essentially dies. It’s better to be early than late, so get down your pre-emergent as soon as you can.
quote:
I just ordered Simazine as well and want to do a split application. Would it be best to do Prodiamine applied at half rate today, then follow up with Simazine at half rate in 2 weeks?
I’m no expert on this, but if you’re using two different pre-emergents, I’m assuming it’s because you have some weeds that one doesn’t target. If you only do a half rate of each, then you may not have a strong enough solution to kill those weeds. Thats my very uneducated guess (I only ever use one). Ronk or Craw would definitely know.
Posted on 10/16/24 at 11:39 am to jordan21210
quote:
I’m in New Orleans and 5 day average is still around 75
Looking at the graph, the average temps are expected to drop to 69-70 later this week but be back up to 80 by 10/24 (last day of forecast). Are we supposed to wait until they are consistently under 70, or when they first drop under 70?
And if we miss this window, catch the next one because even if it's late something s better than nothing?
Posted on 10/16/24 at 12:19 pm to Weekend Warrior79
quote:
Looking at the graph, the average temps are expected to drop to 69-70 later this week but be back up to 80 by 10/24 (last day of forecast). Are we supposed to wait until they are consistently under 70, or when they first drop under 70? And if we miss this window, catch the next one because even if it's late something s better than nothing?
The pre-emergent herbicide kills the embryo as the seed germinates & the seed doesn’t germinate (sprout) immediately at a soil temp of 70 F, particularly if the soil is dry - it has been dry lately. But it’s better to to apply it a little early and water it in than being a little late so that weed barrier is down when the early cool season weed seeds like Poa annua (annual bluegrass) germinate. But since cool season weed seeds germinate throughout the winter, being a little late in application is better than nothing. Many of the pre-emergents mentioned have an efficacy of about 3 months, some maybe a little shorter.
Posted on 10/16/24 at 1:43 pm to CrawDude
Prodiamine granules, better to spread as granules and water or mix in sprayer with water and then water more?
Posted on 10/16/24 at 1:54 pm to Tifway419
quote:
I’m no expert on this, but if you’re using two different pre-emergents, I’m assuming it’s because you have some weeds that one doesn’t target. If you only do a half rate of each, then you may not have a strong enough solution to kill those weeds. Thats my very uneducated guess (I only ever use one). Ronk or Craw would definitely know.
My understanding from brief reading online is both Prodiamine and Simazine target the same weeds but do so in different ways leading to better results. I believe Simazine also has some post emergent abilities.
Posted on 10/16/24 at 1:56 pm to PerplenGold
quote:
Prodiamine granules, better to spread as granules and water or mix in sprayer with water and then water more?
I use granules and water in with my normal daily irrigation schedule (assuming no rain in the forecast). Did this last year and yard did well with winter weeds.
Posted on 10/16/24 at 5:49 pm to PerplenGold
quote:
Prodiamine granules, better to spread as granules and water or mix in sprayer with water and then water more?
I’ve done it both ways and can’t say I’ve seen a difference, just go with what you think works best for you. Spray should be cheaper per 1000 sq ft if that is a consideration.
This post was edited on 10/17/24 at 8:44 am
Posted on 10/16/24 at 5:52 pm to jordan21210
quote:
I believe Simazine also has some post emergent abilities.
This is correct, particularly on young Poa annua (annual bluegrass, if not herbicide resistant).
Posted on 10/17/24 at 10:47 pm to jordan21210
quote:
My understanding from brief reading online is both Prodiamine and Simazine target the same weeds but do so in different ways leading to better results. I believe Simazine also has some post emergent abilities.
I use Simazine in the fall and Prodiamine in the spring. The Prodiamine didn't do anything to stop rescue grass and when I switched to Simazine, it never came back.
That stuff is the devil.
Posted on 10/22/24 at 11:46 am to TDsngumbo
Will the Clegg's cocktail work as a pre-emergent, or is it just to control existing weeds?
Posted on 10/22/24 at 12:14 pm to BayooBandit
quote:No, its a post emergent. Mostly for winter weeds so you would typically spray it in late winter and early spring on existing weeds (before it get's too hot to use it).
Will the Clegg's cocktail work as a pre-emergent, or is it just to control existing weeds?
I'm wrong:
Atrazine, an ingredient in the Clegg's cocktail has pre emergent qualities as well as post. However, I still think it's best used in February and March rather than in the fall.
So does it prevent winter broadleaf weeds or does it kill existing winter weeds and prevent summer broadleaf weeds? Or both? That would be the question...Craw?
Weeds Controlled or Suppressed:
Annual Bluegrass (Poa annua), Chickweed
(Common and Mouseear), Crabgrass (suppression only), Cransbill, Cudweed, Dichondra, Florida Betony, Henbit, Knotweed, Lespedeza, Moneywort, Mustards, Narrowleaf Vetch, Parsley-Piert, Pennywort (Dollarweed), Sandspur, Smutgrass, Spurge, Spurweed, Swinecrest, Woodsorrel and various annual clovers.
If it actually prevents all of these, why is it not talked about more as a fall pre emergent
This post was edited on 10/22/24 at 12:26 pm
Posted on 10/22/24 at 12:34 pm to bayoubengals88
quote:
So does it prevent winter broadleaf weeds or does it kill existing winter weeds and prevent summer broadleaf weeds? Or both? That would be the question...Craw?
Atrazine does have pre-emergent efficacy but it is considered to be a better post-emergent. Simazine, which is chemically related to Atrazine, has stronger pre-emergent efficacy with lower efficacy as a post-emergent. I would not rely on Atrazine as solely as a pre-emergent, consider it solely as a post-emergent & whatever pre-emergent properties it brings to the table consider that as a bonus. The pre-emergents we discuss on this board - Prodiamine, Dithiopyr (Dimension), Specticle, & Simazine - would be superior to Atrazine.
This post was edited on 10/22/24 at 1:22 pm
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