help with weed problem

Kentucky bluegrass, Fescue, Rye and Bent, etc
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oldlyme14
Posts: 2
Joined: August 15th, 2019, 10:35 pm
Location: Connecticut
Grass Type: Northern mix
Lawn Size: Not Specified
Level: Not Specified

help with weed problem

Post by oldlyme14 » August 16th, 2019, 10:34 pm

I have a 5 acre lot with about an acre of grass around my house.

I fertilize it in the spring and have put down Milky Spore to kill the grubs (with good success).

But I don't water it as we are on well water.

Last year, I had a bad crabgrass infestation. I applied Tenacity this Spring and it seemed to help.

But with the hot summer, the crabgrass is back in the sunny areas: :(

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But the grass is fine in the shady areas: :P

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Any thoughts on what to do next to get rid of the weeds in the sunny area?

Thanks

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andy10917
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Location: NY (Lower Hudson Valley)
Grass Type: Emblem KBG (Front); Blueberry KBG Monostand (Back)
Lawn Size: 1 acre-2 acre
Level: Advanced

Re: help with weed problem

Post by andy10917 » August 16th, 2019, 10:45 pm

Time. As the sun gets lower and the days cooler, crabgrass will begin fading in 3-4 weeks in CT. It will also roughly take that much time to beat it with Quinclorac instead.

The way to fight crabgrass is with Pre-M in the Spring, right when the Forsythia bloom. An acre infested with crabgrass in August is not worth fighting in late August.

TimmyG
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Re: help with weed problem

Post by TimmyG » August 16th, 2019, 11:25 pm

And when Andy says Pre-M, he means an effective pre-emergent herbicide like dithiopyr or prodiamine, not Tenacity.

As the weather cools, instead focus on killing perennial broadleaf weeds. A Pre-M applied now or in early fall could be useful in lessening germination of Poa annua and winter annual broadleaf weeds if you have issues with either.

oldlyme14
Posts: 2
Joined: August 15th, 2019, 10:35 pm
Location: Connecticut
Grass Type: Northern mix
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Re: help with weed problem

Post by oldlyme14 » August 17th, 2019, 7:10 pm

Is crabgrass considered a perennial broadleaf weed?

bpgreen
Posts: 3407
Joined: January 3rd, 2009, 2:28 am
Location: Utah (Wasatch Front)
Grass Type: Western, Streambank, Crested wheatgrass in front (with blue grama added in the heckstrips), sheep fescue in back; strawberry clovetr in both
Lawn Size: 3000-5000
Level: Experienced

Re: help with weed problem

Post by bpgreen » August 18th, 2019, 2:19 am

oldlyme14 wrote:
August 17th, 2019, 7:10 pm
Is crabgrass considered a perennial broadleaf weed?
I'm not a weed expert, but I'm pretty sure that crabgrass is about the exact opposite of a partial weed. It's annual, and it's a grass.

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