I certify that I have read this study and that in my opinion it conforms to
acceptable standards of scholarly presentation and is fully adequate, in scope
and quality, as a dissertation for the degree of Doctor of Philosophy.



 H. Glenn Hall, Chair
 Associate Professor of Entomology
 and Nematology



 I certify that I have read this study and that in my opinion it conforms to
acceptable standards of scholarly presentation and is fully adequate, in scope
and quality, as a dissertation for the degree of Doctor of Philosophy.



 James E. Maruniak
 Associate Professor of Entomology
 and Nematology



 I certify that I have read this study and that in my opinion it conforms to
acceptable standards of scholarly presentation and is fully adequate, in scope
and quality, as a dissertation for the degree of Doctor of Philosophy.



 Andrew F. Cockburn
 Assistant Professor of Entomology
 and Nematology



 I certify that I have read this study and that in my opinion it conforms to
acceptable standards of scholarly presentation and is fully adequate, in scope
and quality, as a dissertation for the degree of Doctor of Philosophy.



 Elizabeth ondy
 Assistant Professorof Instruction
 and Curriculum