Sucker Control Trials
• The Regional Sucker Control Trials are conducted under the auspices of the Regional Growth Regulator Committee of the Tobacco Worker’s Conference. Treatments proposed by the committee were treatments 1-7. Treatment 8 was added for this study only. A sprayer malfunction on treatment 2 produced results that were not characteristic of the past performance of this treatment. Treatments 3 (MH at 1.5 gal/a), 4 (Royal MH-30 at 1.5 gal/a + Flupro at 0.5 gal/a), & 5 (Royal MH-30 at 1.5 gal/a + Butralin at 0.5 gal/a) were all excellent treatments. Both the Off-shoot T followed by Off-shoot T + Butralin at 0.5 gal/a & Off-shoot T followed by Off-shoot T + Butralin at 1 gal/a were acceptable, but not as clean as treatments 3-5. Butralin at 1 gal/a by itself was as good as when Off-shoot T was added. All Treatments were made with a West Texas Lee high clearance sprayer using a three nozzle arrangement in a TG-3 – TG-5 – TG-3 configuration and an application volume of 60 gal/a. Applicator speed was 2.4 mph at 30 psi. Plots were 55 ft by 2 rows (42” rows) in a randomized complete block design with four replications.
Regional Sucker Control Treatments*
1st Treatment (Elongated Bud) 2nd Treatment (At topping – 10-25% bloom)
1 Untreated Check
2 Royal MH-30 (2 gal/a)
3 Royal MH-30 (1.5 gal/a)
4 Royal MH-30 (1.5 gal/a + Flupro 0.5 gal/a)
5 Royal MH-30 (1.5 gal/a + Butralin 0.5 gal/a)
6 Off-shoot T (3%) Off-shoot T (4%) + Butralin (0.5 gal/a)
7 Butralin (1 gal/a)
8 Off-shoot T (3%) Off-shoot T (4%) +Butralin (1 gal/a)
* 60 gal/a at 2.4 mph and 30 psi using a West Texas Lee high clearance sprayerTreatments were scheduled for 5 days apart but were applied 7 days apart due to weather
Comparison of Sucker Control Treatments at Two Weeks after Application
UK Spindletop Farm
0
45
96.25 10091.25
60
77.5
32
81.25
0
20
40
60
80
100
%
(MH= Royal MH-30, F=Flupro, B=Butralin,) in (gal) O=Off-Shoot-T in (%), UTC=untreated check, fb=followed by at 7 days. *=Sprayer malfunctioned
The Effects of Sucker Treatment on Sucker Number per Plant
UK Spindletop Farm
6.875
3.425
0.4 0.35 0.3
2.1
0.675
1.94
0.675
0
2
4
6
8
10Suckers/Plant
(MH= Royal MH-30, F=Flupro, B=Butralin,) in (gal) O=Off-Shoot-T in (%),
UTC=untreated check fb=followed by at 7 days. *=Sprayer malfunctioned
The Effects of Sucker Treatment on Sucker Weight
UK Spindletop Farm
0
100
200
300
400
500
600
(g)
Wt/plt 522.5 216.62 9.38 3.87 6.38 92.13 182.38 77.38 164.86
Wt/Sucker 76.68 38.25 18.13 20.4 14.85 162 84.38 101.83 53.46
UTC MH2* MH1.5MH1.5
F.5MH1.5
B.5O3fbO4
B.5B1
O3fbO4 B1
LSD
(MH= Royal MH-30, F=Flupro, B=Butralin,) in (gal) O=Off-Shoot-T in (%),
UTC=untreated check, fb=followed by at 7 days. *=Sprayer malfunctioned
MH Free Trials
• Treatments with MH produced 100% control. However, results from Off-shoot T at 4% followed by a tank mix of Off-shoot T + Butralin at 1 gal/a followed by Butralin at 1 gal/a were close to those containing MH. The results from this treatment (5) were not statistically better than treatments 2, 4, 6, & 7. A 3% concentration of Off-shoot T applied before topping did not perform as well as a 4% concentration. All Treatments were made with a West Texas Lee high clearance sprayer using a three nozzle arrangement in a TG-3 – TG-5 – TG-3 configuration and an application volume of 60 gal/a. Applicator speed was 2.4 mph at 30 psi. Plots were 30 ft by 2 rows (42” rows) in a
randomized complete block design with four replications.
MH Free Trails Treatments
1st Treatment (Elongated Bud)
2nd Treatment At topping ( 10-25% bloom)
3rd Treatment5 days post top
1 Off-Shoot T 3% Off-Shoot T 4% Butralin 1
2 Off-Shoot T 4% Off-Shoot T 4% Butralin 1
3 Off-Shoot T 4% Butralin 1
4 Off-Shoot T 4% Off-Shoot T 4%+Butralin 1
5 Off-Shoot T 4% Off-Shoot T 4%+Butralin 1 Butralin 1
6 Off-Shoot T 4% Flupro 1 Butralin 1
7 Off-Shoot T 4% Butralin Butralin 1
8 Off-Shoot T 4% Royal MH 1.5
9 Off-Shoot T 4% Butralin 0.5+Royal MH1.5
10 Untreated Check
* 60 gal/a at 2.4 mph and 30 psi using a West Texas Lee high clearance sprayerTreatments were applied 5 days apart
MH Free TrialsComparison of Sucker Control Treatments
UK Coldstream Farm
89.596.5
9095.75 99.75 93.5 100 100
05.83
97.75
0
20
40
60
80
100
%
(MH= Royal MH-30, F=Flupro, B=Butralin,) in (gal) O=Off-Shoot-T in (%),
UTC=untreated check (-) followed by at 5 days.
MH Free TrialsThe Effects of Sucker Treatment
on Sucker Number per Plant UK Coldstream Farm
1.630.54 0.96 0.75
0.08 0.38 0.00 0.00
5.63
1.99
0.210.00
2.00
4.00
6.00
8.00
10.00Suckers/Plant
(MH= Royal MH-30, F=Flupro, B=Butralin,) in (gal)
UTC=untreated check O=Off-Shoot-T in (%), (-) followed by at 5 days
MH Free TrialsThe Effects of Sucker Treatment
on Sucker Weight UK Coldstream Farm
0
100
200
300
(g)
Wt/plt 97.3 17.5 47.5 48.8 1.9 13.8 13.3 0.0 0.0 300.0 69.9
Wt/Sucker 63.8 37.5 43.9 36.2 5.6 61.7 34.4 0.0 0.0 63.6 49.2
O3-O4-B1
O4-O4-B1
O4-B1O4-
O4+B1
O4-O4+B1-
B1
O4-F1-B1
O4-B1-B1
O4-MH1.5
O4-B1+MH
1.5UTC
LSD 0.05
(MH= Royal MH-30, F=Flupro, B=Butralin,) in (gal) O=Off-Shoot-T in (%),
UTC=untreated check, (-) followed by at 5 days.
MH-Free Nozzle Study
• Application technique changed a MH-Free sucker control program from unsuccessful to successful. Nozzle size was studied as part of the overall application technique trial. While a rundown method is known to work successfully, mechanical application has proven difficult to achieve acceptable results. All treatments were applied with a CO2 backpack with an over-the –shoulder two row boom. Plots were 40 ft by 2 rows (42” rows) in a randomized complete block design with four replications.
• Treatments consisted of 4% Off-shoot T at elongated bud followed by a combination of Off-shoot T at 4 % plus Butralin at 1 gal /a.
Effects of Nozzle Size on Sucker Control
Nozzles Arrangement PSI MPH Gal
1 TG-3 - TG-5 - TG-3 30 2 60
2 TG-3 - TG-5 - TG-3 30 3 50
3 TG-5 - TG-5 - TG-5 30 3 60
4 TG-5 - TG-6 - TG-5 30 3 60
Effects of Nozzle Size on Sucker Control
0
20
40
60
80
100
3-5-3 (60) 3-5-3 (50) 5-5-5 (60) 5-6-5 (60) LSD 0.05
Nozzles (Gal/a)
% Control
All Nozzles were TG full cone nozzles
Effects of Nozzle Size on Sucker per Plant
0.225 0.2 0.1750.125 0.147
0
0.2
0.4
0.6
0.8
1
3-5-3 (60) 3-5-3 (50) 5-5-5 (60) 5-6-5 (60) LSD 0.05
Nozzles (Gal/a)
Suckers per Plant
All Nozzles were TG full cone nozzles