Seeding after pre-emergent and glyphosate

Kentucky bluegrass, Fescue, Rye and Bent, etc
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EriCS198
Posts: 46
Joined: May 25th, 2019, 9:57 am
Location: Southern Dutchess County, NY
Grass Type: Cool season
Lawn Size: 20000-1 acre
Level: Novice

Seeding after pre-emergent and glyphosate

Post by EriCS198 » May 22nd, 2020, 2:19 pm

Hey guys just a quick question, I applied Prodiamine early April and decided roundup some patches of possible Triv yesterday. Would it be safe to lay a bed of topsoil over these areas and reseed at the moment or do I have to wait? I’m started to question my original plan of laying a bed of topsoil, seeding, and then top dress with peat moss. I hope between the premergent and the glyphosate I don’t have any issues. Thanks

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bernstem
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Location: St. Louis, MO
Grass Type: Front: Solar Eclipse/Award/Bewitched/Moonlight SLT/Prosperity Back: Solar Eclipse Monostand + Bewitched (shade)
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Re: Seeding after pre-emergent and glyphosate

Post by bernstem » May 23rd, 2020, 10:09 am

Prodiamine will prevent the roots from growing past it. If you place topsoil, the grass will germinate, but roots won't grow below the new soil and will struggle. A better option would be to pull plugs from elsewhere in the lawn and transplant them into the dead spots.

EriCS198
Posts: 46
Joined: May 25th, 2019, 9:57 am
Location: Southern Dutchess County, NY
Grass Type: Cool season
Lawn Size: 20000-1 acre
Level: Novice

Re: Seeding after pre-emergent and glyphosate

Post by EriCS198 » May 23rd, 2020, 3:04 pm

Too big of an area to do that, what if I rough up the soil with a dethatcher?

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bernstem
Posts: 4230
Joined: April 15th, 2011, 2:59 pm
Location: St. Louis, MO
Grass Type: Front: Solar Eclipse/Award/Bewitched/Moonlight SLT/Prosperity Back: Solar Eclipse Monostand + Bewitched (shade)
Lawn Size: Not Specified
Level: Not Specified

Re: Seeding after pre-emergent and glyphosate

Post by bernstem » May 24th, 2020, 10:01 am

Dethatcher may help, but I wouldn't count on it though I don't have personal experience trying it. You probably need to break up the top 1-2 inches of soil to be sure you have broken down the Prodiamine barrier. How big an area are we talking about?

EriCS198
Posts: 46
Joined: May 25th, 2019, 9:57 am
Location: Southern Dutchess County, NY
Grass Type: Cool season
Lawn Size: 20000-1 acre
Level: Novice

Re: Seeding after pre-emergent and glyphosate

Post by EriCS198 » May 24th, 2020, 12:43 pm

I would say at least 500 sq ft, I rented a dethatcher today and did the best I could with it. Lesson learned on this one for sure! Worst case scenario I will live with the look until early Sept. and overseed or do a reno which was my plan anyways. Wish me luck, I’ll post the results in due time...

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