Integrating Selective Herbicide and Native Plant Restoration to Control Alternanthera philoxeroides (Alligator Weed) Page: 6
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imzapyr lack evidence for complete control (Allen et al. 2007, Schooler et al. 2008). Kay (1992)
found increased resistance to quinclorac herbicide in a broad stemmed A. philoxeroides biotype
compared to a slender stemmed biotype. Kay (1992) was able to reduce A. philoxeroides biomass
after foliar applications applied to both biotypes, but was unable to completely kill the plant.
Recent field experiments involving relatively new selective aquatic herbicides offer
promising results that can be applied to the development of new integrated A. philoxeroides
control techniques. In a field study at a managed marsh in southeastern Alabama, Allen et al.
(2007) altered A. philoxeroides above ground biomass after applications and interactions of two
herbicides (selective and non-selective), two application dates, and three application rates. Allen
et al. (2007) included effects on native species into the design and found, in addition to a
decrease in A. philoxeroides over controls, an increase of native plant biomass within a year of
July application using selective herbicides over non-selective herbicides. Schooler et al. (2008)
reported presence of A. philoxeroides in all study plots seven months after treatment with
glyphosate, metsulfuron and triclopyr at four applications each and at the highest label
recommended rate. Although not directly tested, Schooler et al. (2008) credits increased
competition from monocots for elimination of A. philoxeroides from 29% of plots sampled one
year after treatment with dicot-selective herbicides (metsulfuron and triclopyr) versus 0%
elimination with non selective herbicide (glyphosate). These studies hint at the possibility of
integrating native plant community involvement with the use of selective herbicides for A.
Given the potential economic and ecological damages that can ensue from the spread of
A. philoxeroides and the paucity of information on effective control measures for this plant, the
objective of this study is to determine the effects of integrating selective herbicide applications
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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/m1/13/: accessed June 28, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .