ACKNOWLEDGMENTS 



This paper is based upon a dissertation submitted to the State 

 University College of Forestry at Syracuse University in partial ful- 

 fillment of the requirements for the degree of Doctor of Philosophy. 



The research was done under the direction of Dr. Savel B. Silver- 

 borg, Associate Professor, to whom the author wishes to express his 

 gratitude. Sincere appreciation is also expressed to Dr. Robert A. 

 Zabel, Chairman of the Department of Forest Botany and Pathology 

 and to Dr. Rav R. Hirt, Professor Emeritus, for their instructive 

 criticisms and valuable advice in planning and presenting the entire 

 study. The author is also indebted to various members of the New 

 York State Conservation Department for use of state areas and for 

 their interest and cooperation. 



Certain phases of the studies on control were completed while the 

 author has been an employee of the Forest Insect and Disease 

 Laboratory, Northeastern Forest Experiment Station, United States 

 Department of Agriculture, Forest Service, at New Haven, 

 Connecticut. 



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