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Crabgrass is Everywhere

August 23, 2016

Many people have been calling and emailing us the past couple of weeks with questions over crabgrass (Digitaria spp.). If you have a light yellow green grass with wider blades than the rest of the turf, that seems to be growing at a much quicker pace than other parts of your yard, you more than likely have crabgrass.

Crabgrass with seed heads.

These plants germinated in the spring, but you didn’t notice them until recently probably. The good news is this grass is a summer annual and the growth will soon slow with the cooler temperatures and the plant will die after a killing frost. If a seed head forms on crabgrass, it can produce thousands of seeds on each plant, so your problem is already started for the next year.

Crabgrass can take over quickly.
Crabgrass quickly moves into areas where turf has been lost.

If you have crabgrass you have a few options:

  1. Since it is so late in the year it is best to just let the cool temperatures remove the crabgrass for you.
  2. Chemical controls exist, but at this stage in the plants development you will need to apply a couple of applications and it still may not kill the plant.
  3. Preemergence herbicides don’t help once the crabgrass has emerged.

Tips for preventing crabgrass:

  1. Fertilize your existing turf this fall. A healthy turf stand will have less weeds due to a more uniform canopy with few openings for crabgrass to move into.
  2. Seed thin spots in the next couple of weeks to help thicken the turfgrass you want.
  3. Maintain turf at 3-4” height of cut. Taller turfgrass stands tend to have less weed pressure since the leaves shade out the germinating crabgrass.
  4. Put out a preemergence herbicide by May 1st in central Iowa, since crabgrass germinates from seed each spring. Crabgrass will germinate once soil temperatures reach 55 degrees Fahrenheit.Try to time this application with a ½ inch rainfall or irrigation within 3-5 days of applying the preemergence herbicide.

Crabgrass is excellent as self seeding.
This area may need some additional grass seed after the first frost.

 

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Dandelions in summer patch areas from last year

May 24, 2016

On July 6, 2015, I posted a blog about summer patch, caused by (Magnaporthe poae), on the turfgrass research area.  It was a major outbreak of this disease.  In late May, a few days ago, I was looking at the area.  The disease is not active now, but the interesting thing about the area is how dandelion seed landed in the dead part of the rings and germinated in the fall and spring. 

 

The first two pictures are from the post on July 6 of last year when the summer patch was active.  The last 4 are from May 20, 2016 showing the dandelions.  The dandelions had been treated with a broadleaf herbicide a week earlier.

 

 

 

From May 2016

 

 

 

 

 

 

 

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2019 Turfgrass Weed Control for Professionals is now Available

January 28, 2019

As of today the 2019 Turfgrass Weed Control for Professionals is now available. Here is what is new with this edition:

 

Changes from 2018 to 2019 edition of Turfgrass Weed Control for Professionals

 

The following sections were added/modified.

  • 2 states (MD and ND) were added as collaborators to this multi-state publication (now 16 total states).
  • No weeds were added but 21 pictures are being changed/added to provide better weed ID assistance.
  • Several minor modifications were made to the weed control efficacy tables.
  • A new Q&A on “new products added to 2019 edition” was added.
  • Change in annual bluegrass seedhead suppression info in PGR section

 

Herbicides Added

 

Trade Name (product/A)

Common Name (lbs ai/A)

Weeds Controlled

Turfgrasses

Comments

Fahrenheit

(3-12 oz)

 

 

[[W]]

dicamba + metsulfuron          (see label)

broadleaf weeds, ryegrasses

bermudagrass, buffalograss, zoysiagrass

Do not use in cool-season turf. Controls a wide range of broadleaf weeds, ryegrasses, and wild garlic/onion. Add NIS at 0.25% (v/v). Do not plant woody ornamentals in treated areas for 1 year after application.

Sure Power
(2-3.5 pts)

 

[[NY]]

2,4-D +

triclopyr +

fluroxypyr +

flumioxazin
(see label)

broadleaf weeds

Kentucky bluegrass, perennial ryegrass, fine fescue, tall fescue

Do not use on creeping bentgrass or turf with significant annual bluegrass. Controls a wide range of broadleaf weeds. Wait at least four weeks after applying before reseeding or sodding. Avoid broadcast applications when daily high air temperatures are forecasted to exceed 80°F. Adding an adjuvant is not recommended and may increase turf injury risk. This herbicide is quick acting with results visible in 2-3 days.

Manuscript

(9.6-19.2 fl oz)

 

 

[[W]] [[L]]

pinoxaden

(0.03-0.06)

Crabgrass, dallisgrass, ryegrass, thin paspalum

bermudagrass,  zoysiagrass

Specialty herbicide for specific grass control within certain turfgrass species. Use as directed spot treatments to targeted weeds. Tank-mix with Adigor surfactant or MSO at 0.5% to 1.0% (v/v) to increase performance. The formulation contains a safener called cloquintocet-mexyl.

Foundation

(3.25-4 pts)

 

[[NY]]

2,4-D + triclopyr + dicamba + sulfentrazone

(see label)

controls many broadleaf weeds

annual bluegrass, Kentucky bluegrass, perennial ryegrass, fine fescue, tall fescue

Controls a broader spectrum of weeds than 2,4-D alone. Not for use on putting greens or tees. Do not apply when temperatures are greater than 90°F. Provides yellow nutsedge suppression only. For newly seeded areas, delay application until after second mowing. Do not use adjuvants.

Triad Select

(1.8-4.0 pts/A)

2,4-D + MCPA + dicamba

(see label)

controls many broadleaf weeds

annual bluegrass, bermudagrass, creeping bentgrass, fine fescues, Kentucky bluegrass, perennial ryegrass, tall fescue, zoysiagrass

Controls a broader spectrum of weeds than 2,4-D alone. Avoid applications when temperatures are greater than 90°F. Delay reseeding 4 weeks after treatment. Do not apply to newly seeded grasses. Limit of 2 applications per year.

Triad SFZ Select

(2.75-4.0 pts/A)

 

[[NY]]

2,4-D + MCPA + dicamba + sulfentrazone

(see label)

controls many broadleaf weeds

annual bluegrass, bermudagrass, buffalograss, creeping bentgrass, fine fescues, Kentucky bluegrass, perennial ryegrass, tall fescue, zoysiagrass

Controls a broader spectrum of weeds than 2,4-D alone. Not for use on putting greens or tees. Avoid applications when temperatures are greater than 90°F. Delay reseeding 3 weeks after treatment. Do not apply to newly seeded grasses until mown twice. Limit of 2 applications per year. Do not use adjuvants.

Momentum 4-Score
(3.5-4.5 pts)

 

[[NY]]

2,4-D + fluroxypyr + triclopyr + sulfentrazone

(see label)

broadleaf weeds

annual bluegrass, creeping bentgrass, Kentucky bluegrass, perennial ryegrass, fine fescue, tall fescue

Controls a broader spectrum of weeds than 2,4-D alone. Not for use on putting greens or tees. Do not apply when temperatures are greater than 90°F. Provides yellow nutsedge suppression only. For newly seeded areas, delay application until after second mowing. Do not use adjuvants.

Products that are labeled for use in only warm-season grasses (bermudagrass, buffalograss, and zoysiagrass) or predominantly warm-season turf are indicated with this symbol: [[W]]. Do not use these products on cool-season turf except by label directions.

Products with sale and/or use restrictions in New York state or Long Island, New York (Nassau and Suffolk counties) are indicated with this symbol: [[NY]]. Refer to the label for more information.

Products only registered in specific states (primarily those states with significant bermudagrass turf) are indicated with this symbol: [[L]]. Check with your state regulatory agency and local suppliers for availability.

 

Herbicides Table Entries changed

Trade Name (product/A)

Common Name (lbs ai/A)

Weeds Controlled

Turfgrasses

Comments

Xonerate 2SC
(3-6 fl oz)

 

 

 

 

 

[[NY]]

amicarbazone
(0.04-0.09)

annual bluegrass and some broadleaf weeds

bermudagrass, buffalograss, creeping bentgrass, fine fescue, Kentucky bluegrass, perennial ryegrass, tall fescue, zoysiagrass

Do not use on golf course putting greens. Apply in spring for annual bluegrass control. Do not apply in summer or fall. Apply when daily high temperatures are 55-80°F. Irrigate soon after application with 0.1 to 0.2 inches of water. Turf quality of Xonerate 2SC treated areas with >10% annual bluegrass will be temporarily reduced. Do not apply to areas where mefluidide has been applied in the previous three months.

 

 

 

Herbicides added (new ingredient(s) or a new combination)

  • Manuscript (pinoxaden) – bermudagrass, zoysiagrass, St. Augustinegrass (labeled in 9 states in our region)
  • Sure Power (2,4-D ester + triclopyr + fluroxypyr + flumioxazin)
  • Fahrenheit (metsulfuron + dicamba)
  • Triad Select (2,4-D amine + MCPA + dicamba)
  • Triad SPZ Select (2,4-D amine + MCPA + dicamba + sulfentrazone)
  • Momentum 4-Score (2,4-D amine + fluroxypyr + triclopyr + sulfentrazone)
  • Foundation (2,4-D DEA + triclopyr + dicamba + sulfentrazone)

 

Herbicides now listed

  • Boulder 6.3 (triclopyr ester)
  • SUREPYC (sulfentrazone)
  • Scepter (imazaquin)
  • Fahrenheit (metsulfuron + dicamba)
  • SedgeMaster (halosulfuron)
  • Halo 5WDG (halosulfuron) – contains surfactant
  • Halo 75WDG (halosulfuron)
  • E-2 (2,4-D + fluroxypyr + dicamba) – same as Escalade 2 but for sod farms
  • Aim EC (carfentrazone) – for sod farms
  • Topeka (dicamba) – for sod farms
  • Rifle (dicamba) – for sod farms
  • Detonate (dicamba) – for sod farms
  • Strut (dicamba) – for sod farms
  • Panoramic 2SL (imazapic)
  • Patriot (metsulfuron)

 

Herbicides New Formulations

  • Xonerate 2SC (amicarbazone)

 

 

 

 

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