Title page for ETD etd-93197-152836

Type of Document Master's Thesis
Author Nespeca, Mathew C.
Author's Email Address nespeca@vt.edu
URN etd-93197-152836
Title Interactive Effects of Imazapyr plus Triclopyr ester and Imazapyr plus Glyphosate Mixtures on Woody Weed Seedlings
Degree Master of Science
Department Forestry
Advisory Committee
Advisor Name Title
Zedaker, Shepard M. Committee Chair
Hatzios, Kriton K. Committee Member
Kreh, Richard E. Committee Member
Seiler, John R. Committee Member
  • imazapyr
  • forestry
  • silviculture
  • herbicide
  • glyphosate
  • triclopyr
Date of Defense 1997-10-17
Availability unrestricted
A rapid primary herbicide screening experiment was

conducted to determine if synergism or antagonism

occurs with imazapyr(Arsenal®) plus triclopyr ester

(Garlon 4®) and imazapyr plus glyphosate(Accord®)

mixtures applied to woody weed seedlings. Using a

booth sprayer, 66 herbicide treatments were applied

to greenhouse grown black cherry (Prunus serotina),

winged elm (Ulmus alata), sweetgum (Liquidambar

styraciflua), red maple (Acer rubrum), black locust

(Robinia psuedoacacia), loblolly pine (Pinus taeda),

water oak (Quercus nigra) and cabbage palmetto (Sabel

palmetto). The seedlings were rapidly screened and

percent mortality, height and dry weight measurements

were obtained five months after treatment. The sweetgum,

red maple and black locust experienced unacceptable

mortality in the control treatments, and were excluded

from further analysis. A determination of synergistic

or antagonistic interactions was made using response

surface analysis, the nonlinear blending method, the

isobologram method, and the Colby method. Imazapyr

plus triclopyr ester mixtures were found to be

synergistic on black cherry (p < 0.05), with antagonism

occurring at high rates of both herbicides. Imazapyr

plus triclopyr ester was additive on the remaining

species. The imazapyr plus glyphosate mixtures were

found to be additive for all tested species.

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