Downy Rose MyrtleHerbicide Field Trial

by Elroy Timmer

CooperatorsSFWMD

Aquatic Vegetation

Control,Inc.

Funding By

BASFDOW

Vanquish and KreniteThe Best Two Treatments in 2007

0

10

20

30

40

50

60

70

80

90

100

2 m o . 6 m o . 10 m o . 14 m o .

Vanquish2 qt.

K renite 6 ga l.

2007 Twenty Acre Treatment

Vanquish at 2 quarts per acre

Treatment by AVC for SFWMD

Meadow Beauty

Gallberry

Bog Bachelor-Button

St. John’s Wort

Downyrose myrtle Treatments 2008

1. Arsenal Powerline Conquer oil 7.5% 32 832. Arsenal Powerline 32 753. Arsenal Powerline 24 Garlon 4 Ultra 64 934. Weedmaster 64 585. Weedmaster 32 Vanquish 32 736. Arsenal Powerline 24 Vanquish 32 767. Arsenal Powerline 32 Glyphosate 112 828. Vanquish 64 789. Krenite 768`

8210. Vanquish 32 Krenite 384 7811. Arsenal Powerline 32 Krenite 128 8512. Weedmaster 64 Krenite 128 62

ozoz % Cntlplus____________________________________________________________________

Downyrose myrtle Treatments

13. Vanquish 32 Overdrive 4 oz 70

14. Vanquish 32 Overdrive 4oz Vista 42 92

15. Garlon 4 Ultra 15% (37.5 gpa) (Cut Stump) 89Labor 60 hours per acre

16. Garlon 3A 384 80

17. Garlon 4 Ultra 24882

18. Vista 42 57

19. Garlon 4 Ultra 256 Vista 4281

20. Milestone VM 1428

21. Vanquish 32 Garlon 4 Ultra 128 90

22. Vanquish 32 Garlon 4 Ultra 128 Vista 42 88

oz plus oz %Cntl______________________________________________________________________

Best Three Treatments on Downy Rose Myrtle at 13 Months in 2009

8888.5

8989.5

9090.5

9191.5

9292.5

9393.5

Arsen al 24 G arlo n 4 64

Van q u ish 32 Overd rive 4 V ista 42

Van q u ish 32 G arlo n 4 128

Arsenal at recommended use rate of 48 oz per

acreArsenal 1% = 37.5 gpa

Arsenal 2 % = 18.75 gpa

Arsenal 3 % = 12.5 gpa

Arsenal max label rate 96 oz

Garlon 4 Ultra 15%Cut Stump Treatment

• 37.5 gal per acre of oil and Garlon mix• Treated 1/100 Acre• 5.625 Garlon 4 Ultra per acre• Per acre rate equals almost 3x label rate• 60 hours labor per acre plus supervisors =

approximately $1,400.00 • Approximately $900.00 herbicide

SFWMD TEST• Plot Layout• Types of plots• Plant height influences control

H

Example of Buggy path through tall 1/8 acre Downyrose myrtle plot 74

ft.

The 1/8 acre plots are (74 x74 ft). Rate was 100 gpa or 12.5 gal. per plot. The spray tip was calibrated at 1.32 gal per minute, it took 9.46 minutes to deliver 12.5 gallons. Plot was made up of 15 subplots A-O. Each subplot was treated with appropriate seconds to apply the proper rate . A, C, D, F, G, I, J, L, M, and O required 51 seconds. B, E, H, K, and N required 12 seconds. Pump produced 1.32 gpm. A stock solution of 33 gallons was used to treat two plots. The remaining 8 gallons was applied outside of the plot.

BA C

D E F

G I

J K L

M N O

15 feet

32 feet 10 ft.

B

E

H

K

N

10 f t .

Plots are 104 x 104 feet. Each subplot (example A and C) on each side of the 10 foot buggy trail is about 21 feet wide, by 15 feet (the length of the buggy). After the buggy moved ahead, the buggy trail (B)(15 x 10 feet) was treated. Each pass though the plot required 12.5 gallons or 9.46 minutes. Both passes required a total of 25 gallons and 18.92 minutes . Subplots such as A and C (21 x 15 feet) required 35 seconds while subplots such as B ( 15 x 10 feet) required 11 seconds. A 33 gallon stock solution was used to treat each plot. The 8 gallon remaining solution was used to treat areas outside the plot. Each pass through the plot required 7 stops at 15 feet each (7x15 = 105 feet)

Example of 1/4 acre tall Downyrose myrtle plot, treated at 100 gpa

Buggy trail

A CB

These 1/8 acre plots were divided in ½ to make treatment more manageable. They were treated at 50 gpa. or 6.25 gallons per plot . Each half required 3.125 gallons and 2.36 minutes or 2 minutes and 22 seconds per ½ plot. The center of each plot was marked for applicators perspective.

Typical 1/8 acre short Downyrose myrtle plots. Treated by hand, red arrow lines depicts approximate path of applicator

Example of hand tank plots (Vanquish) treated at 50 gpa

Each plot was measured and calculated for a percent of an acre. Example A, (11 x 112 feet = 132 square feet) or 0.003099174 of an acre. It was calculated that 4.37 square feet could be treated per second. The square feet per plot was divided by 4.37 to equal seconds per plot. (135 / 4.37 = 30 seconds). The tip used was a Spray Systems 2504 tip at about 20 psi. The spray tank is filled to 100 psi but spray tip delivers a constant pressure of 20 psi at the tip, via a regulator. A one gal stock solution was used. (1/50 of an acre) Excess solution was used to treat surrounding Downyrose myrtle in the area.

A11 feet

12 feet

= 30 seconds 9 feet

squared

= 19 seconds

9 feet squared

17 feet squared

66 seconds

= 19 seconds

B

C

D

Aquatic Vegetation Control

Thank youSalvador Medina

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