Integrating Selective Herbicide and Native Plant Restoration to Control Alternanthera philoxeroides (Alligator Weed) Page: 29
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There was no evidence in the greenhouse experiment of enhanced control of A.
philoxeroides through integrating herbicide application and competitor introduction. When each
component is considered separately, it maybe surmised that the herbicide fulfilled its role, but the
competitive interaction needed was not present. The greenhouse experiment should have
provided the opportunity to run the experiment at any photoperiod desired. Prior to early January
2011, there was inadequate lighting available to keep the introduced plants from falling into their
seasonal senescence cycle. To take advantage of the window of competitive opportunity
provided by the herbicide applications, introduced plants may have benefited from more
vigorous growth associated with longer day lengths. Total biomass at harvest for most untreated
competitors was quite low in comparison to A. philoxeroides. For example, final mean biomass
for untreated Sagitaria was only 1.43g 0.42 as compared to 12.35g 2.86 for untreated A.
philoxeroides sharing the same treatment containers. Size certainly plays a role in a plants ability
to influence neighbors (Goldberg and Werner, 1983). In this experiment, competitors may not
have been given adequate conditions during a critical time to achieve the growth rate and size
required to take advantage of stressed A. philoxeroides.
A. philoxeroides biomass was reduced by triclopyr applications. This result was expected
and reported in the literature (Schooler et al. 2008, Allen et al. 2007). A second application six
weeks after the first did result in further biomass reduction than a single application. To our
knowledge, this has not been reported in A. philoxeroides experiments using triclopyr. Schooler
et al. (2008) reported no difference in A. philoxeroides biomass between three applications and
four applications, but did not test a single or double application in his design. Allen et al. (2007)
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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/m1/36/: accessed June 29, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .