Integrating Selective Herbicide and Native Plant Restoration to Control Alternanthera philoxeroides (Alligator Weed) Page: 14
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using five levels; no re-established native competitors, two re-established native monocot
species, and two re-established native dicot species. The four plant species were selected based
on data from previous field surveys and seed bank surveys taken within the oxbow area.
Field Experiment Table of Treatments
No Justica Polygonum Sagittaria Carex
Competitor americana setaceum platyphylla hyalinolepis
Herbicide 0 n=5 n=5 n=5 n=5 n=5
Application 1 n=5 n=5 n=5 n=5 n=5
Frequency 2 n=5 n=5 n=5 n=5 n=5
Note. Five replicates for each treatment combination were used.
Field Experiment Materials and Methods
Five experimental blocks were established at separate sites within the oxbow. Each block
exhibited relatively uniform hydrology and A. philoxeroides coverage, and was of sufficient size
to house subplots. Study blocks consisted of fifteen 1m2 treatment sub-plots divided into three
columns (Figure 6). To simplify herbicide applications and reduce the risk of cross-plot herbicide
drift, entire columns received the same level of herbicide application frequency. Columns had a
2m buffer zone between them to minimize contamination from drift. Within each column, all
representatives of the "competitor" treatment were randomly assigned a subplot. Two competitor
dicot species; Justica americana and Polygonum setaceum, and two competitor monocot species,
Sagittaria platyphylla and Carex hyalinolepis, were propagated at the University of North Texas
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Adams, Justin. Integrating Selective Herbicide and Native Plant Restoration to Control Alternanthera philoxeroides (Alligator Weed), thesis, December 2011; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc103280/m1/21/: accessed April 27, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .