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Effects of Application Rate, Timing, and Formulation of Glyphosate and Triclopyr on Control of Chinese Privet (Ligustrum sinense)

Published online by Cambridge University Press:  20 January 2017

Timothy B. Harrington  and
James H. Miller
Timothy B. Harrington*
Affiliation:
USDA Forest Service, Pacific Northwest Research Station, 3625 93rd Avenue Southwest, Olympia, WA 98512-9193
James H. Miller
Affiliation:
USDA Forest Service, Southern Research Station, 520 Devall Drive, Auburn University, AL 36849
*
Corresponding author's E-mail: [email protected]
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Abstract

Chinese privet is a nonnative shrub that has invaded mesic forests throughout the southeastern United States during the past century. Foliar sprays of glyphosate and triclopyr were tested in three factorial experiments that included wide ranges of application rate, timing, and formulation to refine methods for controlling Chinese privet. For spring (April) and fall (October and December) applications, percentage control of privet cover averaged 93 to 100% and 49 to 70% for glyphosate and triclopyr treatments, respectively, whereas for summer (June and August) applications, control averaged 67 to 69% and 14 to 26%, respectively (study 1). However, privet control was not influenced by variation in herbicide rates of 1.7, 3.4, 5.0, or 6.7 kg ae/ha compared with each of the five application timings. No differences were found in August comparisons of liquid vs. dry glyphosate products or water-soluble vs. oil-soluble triclopyr products for each of the four rates (study 2). In a comparison of low rates of glyphosate applied in August with or without trenching of plot perimeters to isolate privet clumps (study 3), control increased from 12 to 65% as rate increased from 0 to 0.8 kg ae/ha, suggesting that rate responses may occur at lower values than those tested in studies 1 and 2. Isolation of privet clumps by trenching did not have a statistically detectable effect on privet susceptibility to glyphosate. Low rates of glyphosate (1.7 kg ae/ha or possibly lower) will provide effective control of privet when applied in the spring or fall.

Keywords

GlyphosatetriclopyrChinese privet, Ligustrum sinense LourBottomland hardwoodscrown coverinvasive weedsresponse surface analysis
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 1 , March 2005 , pp. 47 - 54
Copyright
Copyright © Weed Science Society of America 

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