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. 



Dr. A.G.B. Fairchild 

 Professor Emeritus of Entomology 

 and Nematology 



This dissertation was submitted to the Graduate Faculty of the College 

 of Agriculture and to the Graduate School, and was accepted as partial 

 fulfillment of the requirements for the degree of Doctor of 

 Philosophy. 



December, 1984 



4 



Dean ,/£ol 1 ege of Agriculture 



^k j_i> 



Dean for Graduate Studies and 

 Research 



