Integrating Selective Herbicide and Native Plant Restoration to Control Alternanthera philoxeroides (Alligator Weed) Page: 33
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there was no data to measure competitive influence on roots or biomass partitioning. There was
evidence in the greenhouse of influence by one competitor species on A. philoxeroides shoot/root
ratio. There may have been interactions underground that could not be quantified due to
constraints inherent by the chosen data collection method.
Comparing Greenhouse and Field Components
In general, results of the field experiment and greenhouse components were similar, with
a few exceptions. As in the greenhouse component of this study, A. philoxeroides was reduced
by triclopyr applications. In contrast to the greenhouse component, there was no difference
between a single application and two applications in above ground metrics recorded. There was a
reduction in cover after one application in the field, which contrast with no reduction in
cumulative stem length after one application in the greenhouse. We must be cautious about
making direct comparisons between the field and greenhouse components because of data
collection techniques used. For example, we found cumulative stem length was only reduced
after two applications in the greenhouse, but above ground biomass was reduced by one and
further by two. In effect, the stems were still there, but the ratio of mass to length was reduced.
We used human observers to place A. philoxeroides into cover classes in the field. Cover class
estimates could be somewhat inflated in comparison to above ground biomass simply because of
the influence of the presence of stems on sampling estimates, regardless of stem density.
Conclusions and Suggestions for Future Work
This study contributes to evidence that triclopyr is effective at reducing alligator biomass and
cover, but is not successful at completely eliminating the plant. Managers that wish to use
triclopyr to control A. philoxeroides can expect improved results after a second application.
Schooler et al. (2008) attributed improved A. philoxeroides control with selective herbicides over
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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/m1/40/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .