Controlling True Fir Leader Length with NAA- An Update
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Controlling True Fir Leader Controlling True Fir Leader Length with NAA- An UpdateLength with NAA- An Update
Chal Landgren, Rick Fletcher, Mike Bondi, Manuela Huso- OSUJoe Cacka- Research Agronomist, WFS
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EasyRoller in Use on noble fir
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Leader Growth in Abies
• Noble and Nordmann fir tends to “bolt” in the years prior to harvest, leaving trees that are open in the tops and bushy near the ground.
• Leaders exceeding 20 inches (50 cm) are not uncommon during good growth years.
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Success= Intact Leaders within Target Length
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Failure= Dead leader (or too short, too wavy, or semi dead)
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Intermediate Impacts from NAA on Leaders
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Important Variables
• Leader growth potential and weather impacts are unknown before treatment.
• Growers will need to understand site/source growth potential beforehand
• It is a numbers game- some trees will be too short, some still too long, some will show damage at any rate.
• Damage is not “life threatening”
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Study Details-2006 trails
• Trees within 3-5 ft. , leader intact
• Leaders 2-8” at treatment (we treated longer, but did not include data)
• 50 healthy trees/treatment/site- approx.
• 200 trees for each treatment across sites.
• One site too short
• Separate container/roller for each treatment
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Nordmann Fir Leader Controls
(% Leaders within Target Length)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Control 40 80 120 160 250
Treatments
>14 in.
8-14 in.
<8 in.
2005 Nordmann Fir Results Summary- 3 Plots
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Leader Damage -NordmannNordmann Fir
(% Damaged)
0%
5%
10%
15%
20%
25%
0 50 100 150 200 250 300
ml/L Sucker-Stopper RTU
% o
f le
ad
ers
wavy o
r
dead
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Noble Fir Leader Controls
(% Leaders Within Target Length)
0%
20%
40%
60%
80%
100%
Control 40 80 120 160 250 500
Treatment
>14 in
8-14 in.
<8 in.
2005 Noble Fir Results Summary- 4 Plots
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Leader Damage -Noble
Noble fir (% Damaged)
0%10%
20%30%40%
50%60%
0 80 160 240 320 400 480 560
ml/L of Sucker-Stopper RTU
% L
ea
de
rs w
av
y o
r d
ea
d
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2006 Noble NAA Leader Results-Average Length
0
2
4
6
8
10
12
14
16
18
Schmidlin Helmig Low Holiday
control
40
80
120
160
250
500
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NAA impact on buds and leader
At high rates can see smaller buds form on leader, unknown impact
Red streaks may follow leader where rollers touch
Needles red and twisting
Higher % of buds on upper % of Leader
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Noble fir Nordmann fir
Phytotoxicity Phytotoxicity
Surfactant/Treatment Rating* Rating*
UTC 0.09 0.00
Oranj-All 0.25% 0.73 0.04
Oranj-All 0.5% 0.72 0.09
Oranj-All 1.0% 0.73 0.00
COC 0.25% 0.26 0.08
COC 0.5% 0.29 0.14
COC 1.0% 0.15 0.11
MSO 0.25% 0.75 0.12
MSO 0.5% 0.78 0.11
MSO 1.0% 1.05 0.04
A Plus Spreader 0.25% 0.4 0.05
A Plus Spreader 0.5% 0.4 0.23
A Plus Spreader 1.0% 0.59 0.08
Solar 0.25% 0.79 0.03
Solar 0.5% 0.85 0.04
Solar 1.0% 1.01 0.04
BreakThru 0.05% 0.21 0.09
BreakThru 0.1% 0.23 0.13
BreakThru 0.2% 0.5 0.08
Ag300 0.25% 0.4 0.05
Ag300 0.5% 0.39 0.25
Ag300 1.0% 0.7 0.28
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Surfactants TestedProduct Name Product Type Active ingredient
First Choice Oranj-All
d-Limonene Paraflinic hydrocarbons, d-Limonene, Polyoxyethylene glycols, isopropylamine dodecylbenzene sulfonate, Ethylene glycol monobulyl ether --- 100%
First Choice Crop Oil Concentrate
Crop Oil Concentrate Paraffin-based petroleum oil, Polyol fatty acid esters and Polyethoxylated derivatives thereof – 99.9%
First Choice M.S.O.
Methylated Seed Oil Methylated Soybean oil, Alkyphenol Ethoxylate – 100%
First Choice A Plus Spreader
Non-ionic surfactant, spreader-activator and defoaming agent
Alkylphenol Ethoxylate, Glycols, Free Fatty Acids, Dimethylsilioxane ---- 90%
First Choice Break Thru
Organosilicone 100% Polyether-polymethylsiloxane-copolyer
First Choice Solar Methylated Seed Oil with Organosilicone
Proprietary blend of polyalkyleneoxide modified polydimethylsiloxane nonionic emulsifiers and Methylated vegetable oil --- 99%
Ag300 Liquid enzyme preparation Amyloglucosidase/ Glucoamylase
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Surfactant ObservationsTreatments Application
Observation
Untreated Control n/a
Sucker-Stopper (SS) Heavy beading
SS + First Choice Oranj-All 0.5%
SmoothNo beading
SS + First Choice Crop Oil Concentrate 0.5%
ModerateBeading
SS + First Choice MSO 0.5%
SmoothNo beading
SS+ First Choice A Plus Spreader 0.5%
SmoothNo beading
SS + First Choice Solar 0.5%
Moderate Beading
SS + First Choice BreakThru 0.05% Splatters and Drips easily
SS + Ag300 0.5% Very little Beading
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Fate of Trees the Next YearFull Strength- Nordmann
2005 2006