6 PKEFACE. 



The work covered by this report has been carried on in cooperation 

 with the Office of Seed and Plant Introduction and Distribution, 

 through which all of the important date importations have been made. 

 The investigations relating to soil conditions have been carried on in 

 cooperation with the Bureau of Soils. 



ALBERT F. WOODS, 

 Pathologist and Physiologist. 

 OFFICE OF VEGETABLE PATHOLOGICAL 



AND PHYSIOLOGICAL INVESTIGATIONS, 



Washington., D. C., August 14, 1903. 



