FreeHand

NURSERY
CONTAINER
WEED CONTROL
M I C H I G A N
NURSERY&
LANDSCAPE
ASSOCIATION
www.mnla.org
Dr. Hannah Mathers
Ohio State University
Columbus, OH
1/17/12

http://basicgreen.osu.edu
Out-and-about articles
Presentations
Nursery Short Course/ CENTS: Jan.22-25, 2012
1/17/12

Expensive
Herbicide
Application (labor + equipment)
Supplemental hand weeding
Nutrient lost

Hand weeding = 12 to 15.00 / hr.
8 people – 2 days = $1920.00

COST OF HERBICIDES
Preemergence
Cost/acre
Regalekade G $185
OH2 $182
Snapshot $260
Treflan $49
Ronstar $145

Preemergence:
Before emergence
Soil-active
Activity affected by soil
conditions and envir.
Do not kill dormant or germinated
Incorporate = barrier
Postemergence:
Plant- active
Activity affected by plant conditions
and envir.
Contact and systemic
1” germ
1/17/12

TOWER - BASF
• New active ingredient dimethenamid-p
• Seedling shoot growth inhibitor - amide
• Safe directed-spray preemergence in
nurseries and landscapes.
• Combine with Pendulum® aqua cap
• 100 #/ac of each
• Tower 6.6 EC, 21 oz/A = 1X, 64 oz/A = 3X

TOWER
• Annual Bluegrass –
partial control
• Barnyardgrass
• Bittercress (Hairy)
(Cardamine hirsuta)
• Carpetweed
• Crabgrass
• Fall Panicum
• Annual Sedges
• Spurge spp.
• Foxtails
• Goosegrass
• Nightshade spp.
• Nutsedge (Yellow) - partial
• Pigweed spp.
• Ryegrass (Italian)
• Sandbur (Field)
• Shepherds purse
W. annual
• Willowherb (Epilobium sp.) =
products with oxadiazon –
Ronstar 200#/ac

TOWER
Species 1X 2X 4X
Gleditsia X X X
Malus X X
Injury
Berberis Lilac
Buxus Oak
Holly

TOWER - HEMEROCALLIS 'STRAWBERRY CANDY’ AT
LINCOLN NURSERY TWO WEEKS AFTER ONE
APPLICATION AT 3.88 LB AI/AC; (4X). NOTE MINOR
STUNTING OF THE LEAVES AND YELLOWING.

Tower and Pendulum
Rorippa sylvestris
No Injury with BFN Field Liners:
Forsythia ‘Lynwood Gold’
Lilac ‘ Common Purple’
Flowering Almond
Potentilla ‘McKays
White’

FREEHAND
• Dimethenamid- p + pendimethalin (Freehand G)
– BASF
• Freehand 1.75G, 150 lb/A= 1X, 450 lb/A = 3X
• Excellent, broad-spectrum weed control
• One of the longest-lasting preemergence herbicides
in container nurseries – Joe Neal
• Landscape and nursery control weeds other
products not controlling

No Injury
Buxus*
Chamaecyparis
Oak
Lilac*
Viburnum*
1/17/12

FREEHAND
Species 1X 2X 4X
Gleditsia X X X
Portulaca
X
Malus X X X
Forsythia X X
Cercis X X X
Injury
Amelanchier
Astilbe
Cornus florida – 2 nd appl. – Ahrens/Mervosh
2008

Echinacea – Klett
FreeHand 2011 IR-4 Trials
Echinacea Untreated
Echinacea 1X Rate

FreeHand 2011 IR-4 Trials
Echinacea Untreated
Echinacea 2X Rate
Echinacea 4X Rate

Pennisetum
Klett -2009
Neal - 2010
FreeHand – stunting at 2 WAT
Pennisetum alopecuroides ‘Hameln’ - Dwarf Fountain Grass

Pennisetum alopecuroides ‘Hameln’ - Dwarf Fountain Grass

Ceanothus xpal. 'Marie bleu', two weeks after one application of
FreeHand, at 10.6 lb ai/ac (4X), control and 4X. Note the stunting. The
first number = treatment rate with 1 = 1X, 2 = 2X, 3 = 4X and 4 = control.
Wilen - 2007
Stunting as a top view.

C
1X
2X
4X
Hydrangea macrophylla ‘City Vienna’- - FreeHand
- cupping, twisting
Hydrangea macrophylla ‘City Vienna’- - Snapshot

FREEHAND G – REPEAT APPLICATIONS 2X RATE
• More testing:
• Hydrangea
• Pieris
• Blueberry
• Azalea
• Rhododendron

FREEHAND VS. SNAPSHOT
Treatment Rate 2 wat 4 wat 8 wat 12 wat
FreeHand 200
#/ac
Snapshot 200#
/ac
Phytotoxicity
9.3 8.7 8.7a 7.0b
9.0 8.0 6.8b 6.0c
Salvia Geranium Snapdragon Impatiens Ageratum
FreeHand FreeHand 1.9 2.1 2.9 5.8* 0.8
Snapshot Snapshot 1.3 3.6* 2.0 3.7* 0.8

INDAZIFLAM –
ALION – FRUIT TREES
SPECTICLE - TURF
Bayer, OHP - alkylazines
Inhibition of cellulose biosynthesis (CBI)
Long-lasting - soil degradation 150 days
Low application rate – 0.11 lb ai/ac
Suspension concentrate
Granular
Less applications

INDAZIFLAM – BAYER, OHP
0.11, 0.22, and 0.44 lb ai/ac

Syringa ‘Boomerang Purple’
Indaziflam

3W to 11W
7.0-5.5
3W to 11 W
9.75-7.3 2.8
Gr over
Gr under
Indaziflam at 11 WAT
Untreated mulch

3W to 11W
7.25-6.0
3W to 11W
9.75-7.0
Liquid over
Liquid under
Indaziflam 11WAT

Echelon SC
Hydrangea macrophylla 'Mini penny' 2 WAT sulfentrazone +
prodiamine (FMC) F6875 (liquid)= twisting and burn
Hydrangea macrophylla 'All summer beauty’ F6875 granular

Echinacea purpurea 'White satin'

GALLERY INJURY
• Dwarf Euonymus
• Hydrangea*
• Lilac, Buddleia
1/17/12

Sprayables/
Tank mixes
- Some growers and landscapers– saving a lot of money:
Gallery (1.33 #/ac)/ Surflan (2 qts/ac)
Gallery/ Barricade (1#/ac) (no more than 2-3 lbs/season) or Pendulum
WDG (5 #/ac)
Hydrangea, Kerria, Vitex, Buddelia = Snapshot (200 #/ac up to 600
#/ac/12 mon) then Corral (114#/ac)
Many herbaceous = Gallery (1#/ac)/ Barricade (1#/ac) or Pendulum
(4#/ac)
Gailardia, Lavenula, Lobelia, sedum (Barricade (1#/ac) or Pendulum
(4#/ac); Winter - Corral (114#/ac)
1/17/12

KLC-5 nozzle - for backpack spray
FIELDJET NOZ, BRASS
Product Description:
Item number: S1/4KLC-5
$25.34
Chemical Containers, Inc.
413 ABC Road
Lake Wales, FL 33859-6849
Phone - 863-638-1407

Liquid Preemergence Ornamental
Herbicides
Barricade
Surflan
Pendulum
SureGuard
Gallery
Goal
Tower
Pennant Magnum
Dimension
Indaziflam
Sulfentrazone + prodiamine

• Combination Granular preemergents
Snapshot, Preen Plus (Isoxaben + Trifluralin)
Rout - Oxyflourfen (Goal) + Oryzalin (Surflan) – esp. Fall
OH2 – Oxyflourfen (Goal) + Pendimethalin (Pendulum)
RegalStar (Oxadiazon + Prodiamine)
Showcase (Snapshot + Goal)
Jewel (Oxadiazon + Pendimethalin) – Scotts – new
Harrell’s s 75 (oxyfluorfen + trifluralin) – HGH75, HGH63
FreeHand
Biatholon
1/17/12

BIATHOLON - OXYFLUORFEN AND PRODIAMINE
• Biathlon new - Verge granule technology
• Granule - low dust and uniform-sized granule for
greater accuracy.
• The rate is 100 lbs. per acre with a maximum of two
applications per acre per year.
• Re-applications may be made at three-month intervals.
• Controls grass and broadleaf weeds in field and
container ornamentals, ground maintenance and other
non-crop areas.
• Biathlon may also be used on evergreens and conifer
trees including Christmas tree and conifer farms.

• Non-combo Granulars
Pendulum 2G - pendimethalin
Barricade 65WG - prodiamine
Treflan 5G (TR10) - trifluralin
Ronstar G - oxadiazon
Devrinol 2G - napropamide
XL 2G – oryzalin
Broadstar
FreeHand 1.75G – Dimethenamid- p + pendimethalin

SUREGUARD INJURY
• Hydrangea*
• Viburnum
• Buddelia
• Privet
• Spirea
• Buxus
1/17/12

SUREGUARD
• SureGuard is NOT safe on Rose or
Rudbeckia!!
Mathers and Case,
OSU, 2006