Figure 4.
Figure 4: Images of water sensitive spray cards after application of water with PermaGreen Triumph Spreader/Sprayer at 10.9 gal/ac using a single TF-VS3 Turbo FloodJet nozzle to deliver extra coarse droplets at 30 psi (A), a Z-Spray Junior at 10 gal/ac using Albuz AVI-110025 nozzles on a 4-nozzle boom to de- liver coarse droplets at 50 psi (B), a Lesco ChemLawn Spray Gun at 87 gal/ac delivering ultra coarse droplets at 30 psi (C), and a hand-held boom sprayer with XR8002VS flat fan nozzles at 87 gal/ac delivering fine droplets at 30 psi (D). Te yellow contact paper turns blue/purple when in contact with water droplets.
The core take-away messages from this research include:
1. Common broadleaf weeds are equally controlled by postemergence herbicides using a range of commercially available turf application equipment.
2. Low carrier volume equipment with coarse droplet sizes provided acceptable postemergence broadleaf weed control in this study.
Turf herbicide labels need to be updated to indicate when low-volume application equipment is effective.
Tis work was recently published in Crop, Forage and Turfgrass Management (Crop, Forage, and Turf Management 4:180039. doi:10.2134/cftm2018.06.0039)
Aaron Patton, PhD, is Professor, Turfgrass Extension Specialist, Department of Horticulture and Landscape Architecture at Purdue University. In addition, Dr. Patton serves as the Turf News Editorial Advisor for warm-season grasses.
All photos and graphics courtesy of Dr. Aaron Patton TPI Turf News January/February 2019 61
Acknowledgements: Te author wants to express gratitude to the Midwest Regional Turf Foundation, Nufarm Americas Inc., and Dow AgroSciences, LLC for funding this research. Defendor, GameOn, and Relzar are trademarks of Dow AgroSciences, LLC. Tis work was also supported by Hatch project 1004762 from the USDA National Institute of Food and Agriculture.
Literature Cited 1. Knoche, M. 1994. Effect of droplet size and carrier volume on performance of foliage-applied herbicides. Crop Protection 13(3):163-178.
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