UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 209 



: Contribution from the Bureau of Plant Industry 

 WM. A. TAYLOR, Chief 



Washington, D. C. 



PROFESSIONAL PAPER 



August 6, 1915. 



TESTING GRAPE VARIETIES IN THE 



VINIFERA REGIONS OF THE 



UNITED STATES 



By 



GEORGE C. HUSMANN, Pomologist in Charge of 

 Viticultural Investigations 



CONTENTS 



Page 



Introduction 1 



Cooperative Experiment Vineyards and 



Their Nature 2 



Acreage in the California Experiment 



Vineyards 10 



General Plan of Plantings in the Experi- 

 ment Vineyards 10 



Phenological Records 10 



Destruction of Vineyards 11 



Factors in Resistance 12 



Adaptation to Soli, Climatic, and Other 



Conditions 12 



Hybrids 16 



Growth Ratings of Resistant Vines and 



Direct Producers 16 



Congeniality and Adaptability of Vines . 26 

 Behavior of Grapes Grafted and on Their 



Own Roots 27 



Conclusions and Suggestions 155 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1915 



