Update on 2010 Weed Science
Research in the IR-4 Ornamental
Horticulture Program
C. Palmer, E. Vea, K Hester,
J. Baron, and E. Lurvey
2010 IR-4 Weed Science Research
• 2010/2011 Herbicide Crop Safety
• Early Post-Emergent Efficacy
• Liverwort Efficacy
2010/2011 Herbicide Crop
Safety
Photo by C. Palmer
Participating Researchers
Dr. John Ahrens
Dr. Ed Beste
Dr. Rick Boydston
Dr. Mark Czarnota
Dr. Jeff Derr
Dr. Ray Frank
Mr. Ben Fraelich
Mr. Tom Freiberger
Dr. Charles Gilliam
Dr. Paul Harvey
Dr. Jim Klett
Dr. Heiner Lieth
Dr. Hannah Mathers
Dr. Todd Mervosh
Dr. Mike Mickelbart
Dr. Joe Neal
Dr. Mike Reding
Dr. Rich Regan
Dr. Andy Senesac
Dr. Paul Wade
Dr. Cheryl Wilen
Photo by C. Palmer
2010 Herbicide Crop Safety - Methods
• Over the top applications
• Three rates for each product
• First treatment soon after plants broke
dormancy
• Second application 6 weeks after first
• Assess for injury at 1, 2, and 4 weeks after
applications
Herbicide Rating Scale
• Scale from 0 to 10
– 0 = no injury; 10 = mortality
• For following summary table,
– None = 0 to 1
– Minor = 1 to 3
– Moderate = 3 to 5
– Significant = 5 to 9
– Mortality = 9 to 10
Commercially Acceptable
Not Acceptable
Herbicides for 2010 Crop Safety Testing
Product
Number * Number *
of Crops of Trials
Biathlon (oxyfluorfen + prodiamine)
16
42
Broadstar 0.25G V1604 (flumioxazin)
12
22
Certainty (sulfosulfuron)
40
78
Freehand G (pendimethalin + dimethenamid-p)
53
90
Gallery (isoxaben)
6
12
Snapshot (trifluralin + isoxaben)
47
84
Tower EC (dimethenamid-p)
19
32
Echelon (F6875) 0.3G
5
8
Echelon (F6875) 4SC
5
11
Mesotrione 4SC
7
8
* Received by 1/1/2011
Number of crops impacted (or not) by herbicides
Product
None
Minor
Moderate
Significant
Mortality
Biathlon
9
1 (berberis)
1 (hibiscus)
0
0
Broadstar
0
3 (agapanthus,
1 (carex)
0
0
8 (agastache,
astilbe, berberis,
carex, delphinium,
hibiscus, lobelia,
viburnum
1 (scaevola)
Certainty
2
salvia, sedum)
4 (asclepias,
2 (acer, gazania)
buddleia,
pseudotsuga, rosa)
3 (asclepias,
3 (ceanothus,
4 (amelanchier,
Freehand G
10
chaemaecyparis,
cornus)
impatiens, ipomoea,
scavola)
astilbe, pennisetum,
tagetes)
Gallery 75DF
1
0
1 (buddleia)
0
7 (delphinium,
4 (asclepias,
dichanthelium,
hibiscus, hierchloe,
imperata, phlox,
thymus)
dryopteris, heliopsis,
veronica)
0
0
0
0
0
0
0
4
1
0
2
1
2
0
Snapshot 2.5TG
13
Tower EC
5
1 (hemerocallis)
1 (cornus kousa)
Echelon 0.3G
4
1
Echelon 4SC
0
Mesotrione 4SC
2
Liverwort Efficacy
Photo by C. Palmer
Liverwort Project Goal
Manage
liverworts in
enclosed
structures
Photo by Kevin Coleman
Liverwort Efficacy Herbicides
Product (active ingredient)
Rate(s)
Bryophyter (oregano oil extract)
1%; 2%
Champ DP (copper hydroxide)
2.75 lb product per 100 gal;
5.5 lb product per 100 gal
GreenMatch (d-limonene)
14%; 20%
QuickSilver T&O (carfentrazone)
1 oz product per acre;
2 oz product per acre
Racer 40% (ammonium nonanoate)
0.5%; 0.75%
Scythe (pelargonic acid)
5%; 10%
SureGuard (flumioxazin)
12 oz per acre + NIS
Tower 63.9%EC (dimethenamid-p)
32 fl oz per acre
TerraCyte Pro (sodium carbonate
peroxyhydrate)
Liquid: 0.5 lb per gal
Granular: 7.5 lb per 1000 sq ft
WeedPharm (acetic acid 20%)
5%; 10%; 20%
Liverwort Efficacy Materials & Methods
• Applications
– When liverwort covered 50% - 75% of pot surface,
recording stage
– Single application using 90 to 100 GPA
– Second application after 4 weeks if less than 80%
reduction in liverwort
• Evaluations
– At 1, 2, 4, 6, and 12 weeks after treatment
– Scale: 0 to 10; 0 = No efficacy and 10 = Complete Kill
Liverwort Efficacy Participating Researchers
Dr. Ed Beste
Dr. Mark Czarnota
Dr. Jeff Derr
Dr. Joe DeFrancesco
Dr. Ray Frank
Mr. Tom Freiberger
Dr. Charles Gilliam
Dr. Hannah Mathers
Dr. Ed Peachey
Dr. Andy Senesac
Dr. Cheryl Wilen
Photo by Kevin Coleman
Liverwort Examples
Photos by Luke Case, OSU
Average Liverwort Control Across
Experiments
Product
Bryophyter
Champ
1-3
1
2
3
4
5
6
7
8
10
DAT WAT WAT WAT WAT WAT WAT WAT WAT WAT
59
68
58
48
47
61
56
32
25
70
6
20
11
3
7
18
GreenMatch
100
89
77
95
62
QuickSilver
8
11
6
6
3
6
Racer
79
65
51
23
29
Scythe
94
90
84
71
SureGuard
11
42
63
TerraCyte Pro
TerraCyte Pro
Granular
Tower
63
50
15
WeedPharm
16
0
13
5
0
3
2
0
59
61
29
29
71
76
78
71
38
89
79
62
67
73
0
28
100
21
13
14
46
45
13
25
63
67
49
50
50
89
0
0
94
3
19
46
56
51
61
76
57
57
98
98
88
85
90
74
57
68
5
22
84
Conclusions
• Bryophyter provided great initial knock down in most
experiments at 1 and 2% v:v; Gilliam observed better
efficacy on mature liverwort versus young liverwort with a
single application.
• Greenmatch provided good to excellent efficacy
• Racer at 5% tended to provide good control, but with
regrowth
• Scythe at 10% exhibited great efficacy throughout all
experiments
• Sureguard was variable but gave 100% control in some
experiments
Conclusions
• Terracyte Pro as a liquid may have potential but as a
granular did not have sufficient efficacy
• WeedPharm provided great initial knock down in most
experiments at 10 and 20% v:v; Gilliam observed better
efficacy on immature liverwort versus mature liverwort
with a single application.
• Champ and Quicksilver did not provide sufficient efficacy
to warrant further testing.
Acknowledgements
• Regional Field Coordinators
– Michelle Foo
– Edith Lurvey
– Satoru Miyazaki
– Paul Schwartz
– Becky Sisco
• All the researchers who participated
Thank you !
Photo by C. Palmer