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Comparison of Herbicides, Fabric Discs and Mulches for Preventing Weeds in Nursery Containers. TIM ABBEY and TODD MERVOSH The Connecticut Agricultural Experiment Station - Windsor, CT. BACKGROUND. USDA Northeast Regional IPM Project (1998-2000):

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comparison of herbicides fabric discs and mulches for preventing weeds in nursery containers
Comparison of Herbicides, Fabric Discs and Mulches for Preventing Weeds in Nursery Containers

TIM ABBEY and TODD MERVOSH

The Connecticut Agricultural

Experiment Station - Windsor, CT

background
BACKGROUND

USDA Northeast Regional IPM Project

(1998-2000):

Non-chemical weed management options for container-grown woody ornamentals.

- Fabric discs (Geodiscs)

- Mulches (Pine Bark, Cocoa Hull), Corn Gluten Meal

experiment sites
Experiment Sites

Site A.CAES Valley Lab (Windsor, CT):

  • Azalea (Rhod. ‘Girard’s Pleasant White)
  • Winterberry Holly (Ilex verticillata ‘Winter Red’)

Plants provided by Planters’ Choice Nursery

Site B.Summer Hill Nursery (Rockland, CT):

  • Azalea (Rhod. poukhanense ‘Compacta’)
  • Winterberry Holly (Ilex verticillata ‘Red Sprite’)

Plants provided by Summer Hill Nursery

All plants newly potted in 2-gallon containers.

treatments
TREATMENTS

1. UNTREATED CHECK

2. GRANULAR HERBICIDE:

Ornamental Herbicide 2 (100 lb/A)

Oxyfluorfen (2 lb/A) + Pendimethalin (1 lb/A)

3. SPRAYABLE HERBICIDE:

I.Gallery 75DF (1 lb/A) + Pendulum 60DG (5 lb/A)

Isoxaben (0.75 lb/A) + Pendimethalin (3 lb/A)

II. Gallery 75DF (1 lb/A) + Surflan AS (2 qt/A)

Isoxaben (0.75 lb/A) + Oryzalin (2 lb/A)

treatments5
TREATMENTS

4. FABRIC DISC (GEODISC): 9” diameter

5.PINE BARK MULCH: 1” layer

6.COCOA HULL MULCH: 3/4” layer

7.CORN GLUTEN MEAL: 650 lb/A (3.0 g / pot)

Weed seed sown over potting mix surface prior

to first treatment application in 1998:

Windsor - Common Groundselseed

Madison - Birdseye Pearlwortseed

treatment applications
TREATMENT APPLICATIONS

1998

Mid MAY- Applied All Treatments

Mid AUGUST-Reapplied Herbicides & C.G.M.

1999

Mid APRIL, Early JULY, Early OCTOBER -

Applied Herbicides & C.G.M.

Weeds Present (counted & removed at each rating):

Windsor - Groundsel, Bittercress, Oxalis, Horseweed

Madison - Red Maple seedlings, Pearlwort

statistical analyses
STATISTICAL ANALYSES
  • Analysis of Variance conducted
  • Means followed by the same letter are not significantly different (Fishers LSD, p=0.05).
  • Vigor – no transformation
  • Weed Counts – square root transformation
  • Percent Cover – arcsine transformation
ilex vigor 0 10 madison 1998
ILEX Vigor (0-10): Madison 1998

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madison site 1999
Madison site – 1999
  • Several azaleas were discarded by nursery personnel during 1999. Thus, plant vigor data in 1999 at the Madison site has not been presented.
  • Many discarded azaleas that had died were ones that had been fitted with Geodiscs.
  • An explanation for the death of these plants could not be determined.
weed prevention 1999 summary
WEED PREVENTION:1999 SUMMARY

OH-2Very Good

Gallery + SurflanGood

GeodiscsExcellent

Pine Bark mulchFair

Cocoa Hull mulchFair

Corn Gluten MealPoor

slide28

SUMMARY - EFFECTS ON PLANTS

  • OH-2:Minor Injury to Winterberry
  • Gallery + Pendulum:

Injured Azalea, Winterberry (esp. at Windsor)

  • Geodiscs:Excellent Plant Vigor (except Azalea at Summer Hill late in 2nd year)
  • Pine Bark Mulch:Good Plant Vigor
  • Cocoa Hull Mulch:Generally Good Plant Vigor
  • Corn Gluten Meal:Excellent Plant Vigor
geodisc fabric discs
GEODISC FABRIC DISCS
  • Provided comparable or superior weed prevention than standard herbicide treatments in containers.
  • Ideal for single-stem plants that are sensitive to herbicides (hydrangeas, EACs, etc.).
  • Stayed intact for at least 2 years - Reusable?

Potential Limitations:

  • Expensive for large-scale use
  • Need proper fit in containers, blow-out potential
  • Death of azaleas at one of two sites… Explanation?