Theses and Dissertations

Issuing Body

Mississippi State University


Catchot, Angus L., Jr.

Committee Member

Cook, Donald R.

Committee Member

Musser, Fred R.

Committee Member

Stewart, Scott D.

Committee Member

Leonard, Billy Rogers

Other Advisors or Committee Members

Allen, Thomas W., Jr.

Date of Degree


Document Type

Graduate Thesis - Open Access



Degree Name

Master of Science (M.S.)


College of Agriculture and Life Sciences


Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology


Field corn, Zea mays L., has been introduced to the market with pyramided Bacillus thuringiensis (Bt) corn technologies. These technologies reduce kernel damage from ear feeding caterpillar pests, including corn earworm, Helicoverpa zea (Boddie). The first generation Bt traits in field corn demonstrated limited activity on corn earworm feeding on grain in ears. The pyramided corn technologies have greater cumulative protein concentrations and improved expression throughout the plant, so these corn traits should provide an effective management tool against these pests. In addition, reduced kernel injury may also have a direct effect on physical grain quality. The results for this trial showed no relationship between number of damaged kernels and yield was observed for corn hybrid expressing the Herculex®, YieldGard®, or Genuity VT Triple Pro® technologies. A significant relationship between both damaged kernels and test weight and damaged kernels and aflatoxin concentrations was observed in two technologies.