Transcript extension.oregonstate.edu

Controlling True Fir Leader
Length with NAA- An Update
Chal Landgren, Rick Fletcher, Mike Bondi, Manuela Huso- OSU
Joe Cacka- Research Agronomist, WFS
EasyRoller in Use on noble fir
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.
Success= Intact Leaders within
Target Length
Failure= Dead leader
(or too short, too wavy, or semi dead)
Intermediate Impacts from NAA on
Leaders
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”
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
2005 Nordmann Fir Results Summary- 3 Plots
Nordmann Fir Leader Controls
(% Leaders within Target Length)
100%
90%
80%
70%
60%
>14 in.
50%
8-14 in.
<8 in.
40%
30%
20%
10%
0%
Control
40
80
120
Treatments
160
250
Leader Damage -Nordmann
Nordmann Fir
% of leaders wavy or
dead
(% Damaged)
25%
20%
15%
10%
5%
0%
0
50
100
150
200
250
ml/L Sucker-Stopper RTU
300
2005 Noble Fir Results Summary- 4 Plots
Noble Fir Leader Controls
(% Leaders Within Target Length)
100%
80%
60%
>14 in
8-14 in.
<8 in.
40%
20%
0%
Control
40
80
120
Treatment
160
250
500
Leader Damage -Noble
Noble fir
% Leaders wavy or
dead
(% Dam aged)
60%
50%
40%
30%
20%
10%
0%
0
80
160
240
320
400
ml/L of Sucker-Stopper RTU
480
560
2006 Noble NAA Leader ResultsAverage Length
18
16
14
control
40
80
120
160
250
500
12
10
8
6
4
2
0
Schmidlin
Helmig
Low
Holiday
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
Noble fir
Nordmann fir
Phytotoxicity
Phytotoxicity
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
Surfactant/Treatment
Surfactants Tested
Product 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, spreaderactivator 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
Surfactant Observations
Treatments
Application
Observation
Untreated Control
n/a
Sucker-Stopper (SS)
Heavy beading
SS + First Choice
Oranj-All 0.5%
Smooth
No beading
SS + First Choice
Crop Oil Concentrate 0.5%
Moderate
Beading
SS + First Choice
MSO 0.5%
Smooth
No beading
SS+ First Choice
A Plus Spreader 0.5%
Smooth
No 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
Fate of Trees the Next Year
Full Strength- Nordmann
2005
2006