Technical Report
 

"Waving Wand" Broadcast Hand Application of Herbicides: Technical Basis and Usage

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Abstract
  • The waving-wand system of broadcast chemical application implemented in swath widths to 40 ft (>12 m) is capable of simulating broadcast deposition patterns for herbicides similar to those delivered by helicopter. Drop sizes vary from center to edge of swaths, which can range from >1,000 to 5,000 microns (μ). Any backpack sprayer is suitable for such treatments if it has a brass adjustable-cone nozzle and is operated by a trained operator. Effective 3-yr vegetation control was achieved on two forest ecosystem management research areas with a total of 42 plots, ranging from 1.2–1.8 ac (0.5–0.73 ha) in size, on variously steep terrain. Experimental applications of glyphosate (1.5 lb a.e./ac, 1.7 kg/ha) plus imazapyr (2.0 or 2.8 oz a.i./ac, 0.14 or 0.2 kg/ha) plus sulfometuron (2.3 oz a.i./ac, 0.16 kg/ha) in water at 3 gal/ac total volume (28 L/ha) or glyphosate plus imazapyr in a total spray volume of 5 gal/ac (47 L/ha) provided excellent control of numerous deciduous shrubs and two species of ferns following July applications. Equipment consisted of a 6-gal (23 L) backpack sprayer with a single adjustable cone nozzle. Operational considerations focus on consistency of walking speed, swing, and nozzle setting. Rates of 1.0-2.5 ac (0.4 to 1.0 ha)/operator hour are achievable, depending on obstacles. The method appears suitable and practicable for highly translocated, low-toxicity products applied to target vegetation <10 ft (<3 m) tall and to understories where individual targets may be up to 16 ft (5 m) tall. Low volume is a major logistical benefit. This system is suited for most broadcast site preparation and release areas unsuitable for aerial application, and understory target areas beneath overstories dense enough to intercept significant herbicide if aerially applied.
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  • Newton, Michael, Elizabeth C. Cole, and Jack W. Barry. 2009. “Waving Wand” Broadcast Hand Application of Herbicides: Technical Basis and Usage. Contributions in Education and Outreach No. 2, Forest Research Laboratory, Oregon State University, Corvallis.
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Déclaration de droits
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