Downy Rose Myrtle Herbicide Field Trial by Elroy

Downy Rose Myrtle Herbicide Field Trial by Elroy Timmer Cooperators SFWMD Funding By BASF DOW Aquatic Vegetation Control, Inc.

Vanquish and Krenite The Best Two Treatments in 2007

2007 Twenty Acre Treatment Vanquish at 2 quarts per acre Treatment by AVC for SFWMD

adow Beauty

Gallberry

Bog Bachelor-Button

ohn’s Wort

Downyrose myrtle Treatments 2008 oz plus oz % Cntl __________________________________ 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Arsenal Powerline Weedmaster Arsenal Powerline Vanquish Krenite Vanquish Arsenal Powerline Weedmaster Conquer oil 7. 5% 32 32 24 Garlon 4 Ultra 32 24 32 Vanquish Glyphosate 32 32 64 Krenite 83 75 64 93 64 58 32 73 32 76 112 82 64 78 768` 82 384 78 128 85 128 62

Downyrose myrtle Treatments oz plus oz %Cntl ___________________________________ 13. Vanquish 32 Overdrive 4 oz 14. Vanquish 32 Overdrive 4 oz Vista 15. Garlon 4 Ultra 15% (37. 5 gpa) (Cut Stump) Labor 60 hours per acre 16. Garlon 3 A 17. Garlon 4 Ultra 18. Vista 19. Garlon 4 Ultra 256 Vista 20. Milestone VM 21. Vanquish 32 Garlon 4 Ultra 22. Vanquish 32 Garlon 4 Ultra 128 Vista 42 70 92 89 384 248 42 42 14 128 42 80 82 57 81 28 90 88

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

Arsenal at recommended use rate of 48 oz per acre n. Arsenal 1% = 37. 5 gpa n. Arsenal 2 % = 18. 75 gpa n. Arsenal 3 % = 12. 5 gpa n. 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 3 x 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

Example of Buggy path through tall 1/8 acre Downyrose myrtle plot 15 feet M N N O J K K L 32 feet 10 ft. H G H 74 ft. I 10 ft. D EE A BB F C The 1/8 acre plots are (74 x 74 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.

Example of 1/4 acre tall Downyrose myrtle plot, treated at 100 gpa Buggy trail A B C 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 (7 x 15 = 105 feet)

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

Example of hand tank plots (Vanquish) treated at 50 gpa 11 feet A 12 feet = 30 seconds 9 feet squared B 9 feet squared = 19 seconds C = 19 seconds 17 feet squared 66 seconds D 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.

Aquatic Vegetation Control Is there any questions? Thank you Salvador Medina