Integrating Selective Herbicide and Native Plant Restoration to Control Alternanthera philoxeroides (Alligator Weed) Page: 17
The following text was automatically extracted from the image on this page using optical character recognition software:
individual plants of its assigned species. Individual plants were uniformly dispersed within
subplots using a PVC planting "jig" (Figure 7). The "jig" was placed at each right angle corner
of subplots and directed the planter to a specific planting location so plants were situated
identically across all treatment plots. On day 28, one of the previously sprayed columns in each
study block was randomly selected to receive the second herbicide treatment. Two-hundred
thirty-seven days after the initial herbicide application, A. philoxeroides coverage was evaluated
in the field with the Daubenmire method. The Daubenmire method allows a sampler to place
percent cover estimates into one of six cover classes (Table 3) (Dabenmire 1959). Digital photos
of each subplot were taken as well. This data has been archived for use in future projects where
comparisons of the historic plant community in the subplots may be appropriate (Figure 16).
Cover Classes of Daubenmire Method
Daubenmire Cover Class Range of Coverage Midpoint of Range
1 < 5% 2.5%
2 5-25% 15.0%
3 25-50% 37.5%
4 50-75% 62.5%
5 75-90% 85.0%
6 95-100% 97.5%
A two-way randomized complete block analysis of variance (ANOVA)(SAS Institute
2003) was used to test effects of competitor species, herbicide application frequency, and all
interactions on A. philoxeroides mean cover class midpoints. A duplicate analysis was run with
individual species combined as monocots or dicots. Data met requirements for normality and
Here’s what’s next.
This thesis can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Thesis.
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/m1/24/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .