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Crab Grass - Pre/Post Emergent

Posted on 2/17/24 at 10:25 am
Posted by LSUTiger23
Baton Rouge LA
Member since Jun 2010
1134 posts
Posted on 2/17/24 at 10:25 am
I haven’t put any pre or post emergent down yet this year to prevent crab grass in centipede grass. What should I put down at this point? Or is it not worth it at this point? If there’s a product that works on crab grass and other spring weeds, that would be great as well.

Any advice is greatly appreciated.
Posted by Bayou
CenLA
Member since Feb 2005
36683 posts
Posted on 2/17/24 at 10:38 am to
pre emerge




post emerge

Posted by CrawDude
Baton Rouge
Member since Apr 2019
5259 posts
Posted on 2/17/24 at 11:46 am to
Dimension (dithiopyr) pre-emergent. It does have post-emergent activity on seedling crabgrass that other pre-emergents do not have.

If you are in BR, you can buy it as a granular LESCO 0-0-7 product at Site One Landscape Supply at a very good price (not open on weekends) or as a Fertlilome/Hi Yield product at the retail garden centers like Cleggs, Louisiana Nursery, PlantTech, ….

Sethoxydim post-emergent herbicide can be used to control crabgrass in a centipede lawn but not other warm-season turf grasses. For other lawn weeds Fertilome Weed Free Zone, Atrazine, MSM Turf, Celsius are all good post-emergent herbicides that can be used at various times throughout the year on centipede. Sedgehammer (halosulfuron) for sedges (nutgrass, kyllinga).
This post was edited on 2/18/24 at 3:03 pm
Posted by shoelessjoe
Member since Jul 2006
9888 posts
Posted on 2/17/24 at 4:03 pm to
Crawdude, what is the rate of prodiamine that should be put out per 1k? I put out 5.2g Thursday and someone questioned it saying I may have shortened myself but I am putting another application in 6 weeks.
Only issue I had was my battery was dying so didn’t get an even spray but just went back over everything until I emptied sprayer so I guess some is better than none.
Posted by StraightCashHomey21
Aberdeen,NC
Member since Jul 2009
125365 posts
Posted on 2/18/24 at 12:58 am to
quote:

pre emerge


That weed stop isn’t meant for centipede

It’s actually a pre and post that has 2-4D
This post was edited on 2/18/24 at 7:45 am
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5259 posts
Posted on 2/18/24 at 10:39 am to
quote:

Crawdude, what is the rate of prodiamine that should be put out per 1k? I put out 5.2g Thursday and someone questioned it saying I may have shortened myself but I am putting another application in 6 weeks. Only issue I had was my battery was dying so didn’t get an even spray but just went back over everything until I emptied sprayer so I guess some is better than none.

Yes - I saw the post in the other thread and the comment from meeple.

It’s looks like you were following this plan/suggestion which spreads the max allocation of Prodiamine per 1000 sq ft in 3 application throughout the year with the highest application in the fall. Because you using Specticle pre-emerg in Fall, I think you could/should increase your next Prodiamine application in 6 weeks to 10.4 g or 18.3 g/1000 sq ft which will still put you under or at the max annual application of Prodiamine of 0.83 oz (23.5 g)/1000 sq ft annually. If I had a history serious weed issues in the summer I might choose the 18.3 g over the 10.4 g. Anyway, that’s the approach I would take with my lawn.


Posted by shoelessjoe
Member since Jul 2006
9888 posts
Posted on 2/18/24 at 12:33 pm to
I don’t have a history of weeds in my yard. It’s a new home build and it’s natural Bermuda. I hit it hard with Celsius in the summer and a little MSMA. Been very clean during the fall so far. So you are saying 5.2g twice isn’t enough?
I went back to an old thread that I asked you and ronk about Specticle Flo and Ronk said split app of prodiamine and a single app of SF. I forgot to ask about prodiamine.
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5259 posts
Posted on 2/18/24 at 2:52 pm to
quote:

Been very clean during the fall so far. So you are saying 5.2g twice isn’t enough?

No, not trying to imply that - if you go with an additional 5.2 g /1000 sq ft you’ll still still be applying 0.32 oz/1000 sq yearly which is on the low end of the recommended labeled annual rate of Prodiamine for Bermudagrass. Since it’s a new lawn you are establishing it’s probably best you go with the lower rate. TLDR: it’s OK to go with a second 5.2 g/1000 sq ft application.
Posted by LSUTiger23
Baton Rouge LA
Member since Jun 2010
1134 posts
Posted on 2/24/24 at 9:24 am to
I am going to put down the winter weed cocktail today on my centipede lawn. Would it be safe to put down the post emergent shared in the above post at the same time? Or should I wait?

TIA.
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5259 posts
Posted on 2/24/24 at 9:30 am to
quote:

am going to put down the winter weed cocktail today on my centipede lawn. Would it be safe to put down the post emergent shared in the above post at the same time? Or should I wait?

The winter weed cocktail is a post-emergent. Do you mean putting down a “pre-emergent” at the same time? If so, the answer is yes it’s safe, but don’t water in the pre-emergent for at least 48 hours.
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