New and Traditional Lawn Care Application Equipment Perform
Similarly Tis research revealed that there were no differences in dandelion or white clover control as influenced by the main effect of application equipment (Figure 3). Mean dandelion control 8 ranged from 74 to 82 percent between equipment types with white clover control ranging from 85 to 93 percent. Additionally, a comparison of low carrier volume application equipment (i.e. PermaGreen, Z-Spray) to high carrier volume application equipment (i.e. lawn gun, hand-held boom) revealed no differences in dandelion or white clover control (data not shown).
Te Lesco ChemLawn Spray Gun and the hand-held boom with flat fan nozzles provided excellent spray coverage (Figure 4) when applied at 87 gal/ac despite the contrasting ultra coarse and fine droplets delivered, respectively. A key paper by Knoche (1994) noted that a challenge in decreasing spray carrier volumes is that it increases the likelihood that the spray droplet may ‘miss’ its target and that efficacy is reduced when applying herbicides with limited mobility. Te PermaGreen
Figure 3.
equipment tested in this experiment applies 10.9 gal/ac via an extra coarse droplet size. Te low carrier volume application from the Z-Spray is delivered with coarse droplets. Despite a low carrier volume and coarse droplet size resulting in poorer spray coverage (Figure 4), weeds were equally controlled with low volume equipment. Tis is likely due to the high phloem mobility of the herbicides tested.
Tis research highlights that common broadleaf weeds are equally controlled by postemergence herbicides across a range of application equipment and spray carrier volumes. Additionally, the similar performance of the application equipment tested allows for greater flexibility for applicators to use multiple pieces of equipment in their fleet depending on the individual site needs. Te nozzles on PermaGreen and Z-Spray ride-on sprayers as well as the Lesco ChemLawn Spray Gun effectively deliver herbicides while reducing the risk of drift compared to flat fan nozzles delivering fine droplets. It is suggested that turf herbicide labels be updated to indicate when low-volume turf application equipment is effective and that manufacturers test new products with low- volume turf application equipment before launching the product and finalizing label statements.
Figure 3: Dandelion and white clover control with different postemergence herbicides as influenced by four different types of application equipment. Within species, statistical analysis indicated the equipment performed similarly.
60 TPI Turf News January/February 2019
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