Light-Activated, Sensor-Controlled Sprayer Provides Effective Postemergence Control of Broadleaf Weeds in Fallow

• Published in: Weed technology Vol. 25; no. 3; pp. 447 - 453
• Main Authors: Riar, Dilpreet S, Ball, Daniel A, Yenish, Joseph P, Burke, Ian C
• Format: Journal Article
• Language: English
• Published: 810 East 10th St., Lawrence, KS 66044-7050 Weed Science Society of America 01.07.2011; Cambridge University Press
• Subjects: Broadcasting industry; Chemical fallow; Crop science; Fallow land; Fallowing; herbicide efficacy; herbicide resistance; Herbicides; Mustards; Organic soils; Sensors; Soil water; Sprays; synthetic auxins; Weed control; WEED MANAGMENT—TECHNIQUES; Weeds; Wheat soils; winter wheat
• ISSN: 0890-037X; 1550-2740
• DOI: 10.1614/WT-D-10-00013.1

A study was conducted in summer fallow fields near Davenport, WA, and Pendleton, OR, in 2007 and 2008 to evaluate the POST weed control efficacy of herbicide treatments applied with a light-activated, sensor-controlled (LASC) sprayer compared to the broadcast application of glyphosate. The LASC application of glyphosate alone (at all rates) and in mixture with pyrasulfotole plus bromoxynil or 2,4-D had weed control (≥ 88%) and dry weight (≤ 6% of control) similar to the broadcast application of glyphosate across locations and years. Tumble pigweed and prickly lettuce control with bromoxynil, 2,4-D, or carfentrazone plus dicamba, was 12 to 85% less than glyphosate applied alone with LASC or broadcast sprayer. Overall, none of the tested alternate herbicides was promising enough to replace glyphosate under present conditions. Nomenclature: 2,4-D; bromoxynil; carfentrazone; dicamba; glyphosate; pyrasulfotole; prickly lettuce, Lactuca serriola L. LACSE; tumble mustard, Sisymbrium altissimum L. SSYAL; tumble pigweed, Amaranthus albus L. AMAAL.