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. 



Professor of Ent< 

 Nematology 



Chair 

 gy and 



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. 



Dale H. Habeck 

 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 . 



~-~} 



Michael C. Thomas 

 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. 



) ^aJ. 



imes W. Kimbrough 

 Professor of Plant Patho 



