Theses and Dissertations

Issuing Body

Mississippi State University


Madsen, John D.

Committee Member

Shaw, David R.

Committee Member

Tomaso-Peterson, Maria

Committee Member

Schauwecker, Timothy

Date of Degree


Document Type

Graduate Thesis - Open Access


Weed Science

Degree Name

Master of Science (M.S.)


College of Agriculture and Life Sciences


Department of Plant and Soil Sciences


A point intercept survey was conducted from 2005 to 2010 on the Ross Barnett Reservoir near Jackson, MS to calculate the frequency of occurrence of all aquatic plant species in the Reservoir. style='mso-spacerun:yes'> Water lotus ( style='mso-bidiont-style:normal'>Nelumbo lutea Willd.) was the native species that occurred most often, while alligatorweed (Alternanthera style='mso-bidiont-style:normal'> philoxeroides [Mart.] Griseb.) occurred most often with regard to non-natives. A logistic regression model indicated that as species richness increases, the probability of observing a non-native species also increases. Herbicide evaluations implied that the chemical imazapyr provided the largest biomass reduction in alligatorweed over a twelve week period; however, 2,4-D would be the most economical option for long-term control. A pathogen study on alligatorweed revealed the presence of the fungus (Ceratorhiza style='mso-bidiont-style:normal'> hydrophilum [ class=SpellE>Xu, Harrington, Gleason, Et class=SpellE>Batzer, Comb., Nov. ( style='mso-bidiont-style:normal'>Sclerotium hydrophilum [Sacc.]). style='mso-spacerun:yes'> Future studies should verify the potential or lack thereof of this fungus being a biological control agent on class=SpellE>alligatorweed.