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Spray Spectrum of Spray Droplets Concerning Fungicide Control in Dense Canopy

Spray Spectrum of Spray Droplets Concerning Fungicide Control in Dense Canopy. Selecting the proper nozzle:. Legal issues!! Following the label!. Changes in the Application Industry!. Historically inefficient process Increased cost per acre for crop protection

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Spray Spectrum of Spray Droplets Concerning Fungicide Control in Dense Canopy

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  1. Spray Spectrum of Spray Droplets Concerning Fungicide Control in Dense Canopy

  2. Selecting the proper nozzle: Legal issues!! Following the label!

  3. Changes in the Application Industry! • Historically inefficient process • Increased cost per acre for crop protection • Rates are changing (< an ounce/acre) • More pest specific products (foliar) • Biotechnology and GMO’s – Issues???? • More sophisticated equipment(electronics) $$$ • Environmental impact (water and air quality) • Drift!!!!!!! • Variable rates • Site-specific • ASR

  4. Nozzles are important because: • Control the amount – GPA. • Determine uniformity of application. • Affects the coverage. • Influences the drift potential.

  5. Nozzle Technology? • Nozzles designed to reduce drift • Improved drop size control • Emphasis on ‘Spray Quality’

  6. Nozzle Spray Spectrum

  7. 1/2 of spray volume = smaller droplets VMD 1/2 of spray volume = larger droplets

  8. Comparison of Micron Sizes for Various Items: (approximate values) • pencil lead 2000 (m) • paper clip 850 (m) • staple 420 (m) • toothbrush bristle 300 (m) • sewing thread 150 (m) • human hair 100 (m) 150

  9. Cutting Droplet Size in HalfResults in Eight Times the Number of Droplets 250 Microns 250 Microns 500 Microns 250 Microns 250 Microns 250 Microns 250 Microns 250 Microns 250 Microns

  10. Air-Induction/Venturi Nozzles • Where air is drawn into the nozzle cavity and exits with the fluid.

  11. Air/Induction – Venturi Nozzle: • Greenleaf – TurboDrop • Air intake venturi section • Mixing Chamber - air and spray solution blended • Pattern tip forms large air-bubble drops • Exit tip flow 2X venturi orifice • Better Penetration? • Reduced run-off? • Improved coverage? • Adequate efficacy? • Reduced drift?

  12. TTI Nozzle (XC)

  13. What about the cost of the nozzle? $2-$3 $5-$10

  14. Nomenclature: Extended Range Trade Name (S,H,P,K,SS) Stainless Steel Insert Orifice VisiFlo Color Coding Fan angle and flow rate-orifice size Rated Pressure = 40 psi for most nozzle types 10 psi for turbo flood nozzles

  15. Turbodrop XL @ 20, 40, 80 psi XR Flat-fan @ 20, 40, 80 psi 20 40 80 20 40 80

  16. Why is Spray Spectrum Important? • Asian Soybean Rust • Potential for large yield impacts • Currently on the way… • Applications have to done Correctly Timely

  17. ASR BMP’s for Nozzle Selection • Application rate = 20 GPA • Use MEDIUM droplets • Use a twin nozzle package • Purchase your nozzles NOW! • Prepare your sprayer and calibrate NOW!

  18. Virginia Ag Expo 2005

  19. Section #1TurboDrop XL – 100oTDXL11005 – 15 GPACOARSE Droplets

  20. Section #4TJ60-8008 TwinJet22 GPAMEDIUM Droplets

  21. Section #5 - YellowXR Flat FanXR8002 - 6GPAFINE Droplets

  22. Why Droplet Size is Important? Droplet size and surface coverage. Droplet sizes of 220 microns or even smaller are suggested for ASR control.

  23. Spray droplet size classification and uses

  24. ASR – medium droplet

  25. Twin Nozzles

  26. Nozzle Spreadsheethttp://www.ppws.vt.edu/ipm/soybeanrust/index.htm

  27. ASR BMP’s for Nozzle Selection • Application rate = 20 GPA • Use MEDIUM droplets • Use a twin nozzle package • Purchase your nozzles NOW! • Prepare your sprayer and calibrate NOW!

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