IfJIMI 



UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 813 



Contribntion from the Bnrean of Plant Indostir 

 WM. A. TAYLOR. Chief 



Washington, D. C. 



PROFESSIONAL PAPER 



June 25, 1920 



CITRUS-FRUIT IMPROVEMENT 



A STUDY OF BUD VARIATION IN THE 



EUREKA LEMON 



By 



A. D. SHAMEL, Physiologist, L. B. SCOTT, Pomologist, C. S. POMEROY, 

 Assistant Pomologist, and C. L. DYER, Scientific Assistant, Fruit- 

 Improvement Investigations, Office of Horticultural 

 and Pomological Investigations 



CONTENTS 



Page 



Importance of the Lemon Industry . . 1 



History of the Eurelca Variety .... 3 



Variability within the Variety 3 



Objects of the Investigations 6 



Plan of the Investigations 7 



Methods of Keeping Performance Rec- 

 ords 8 



Descriptions of the Important Strains . 13 



Lessons Tanght by These Investigations 23 



Presentation of Data 25 



Page 

 Comparative Valae of the Strains ... 78 

 The Unintentional Propagation of Unde- 

 sirable Strains 79 



The Isolation of Strains through Bud 



Selection 80 



Top- Working Undesirable Trees ... 81 

 Replacing Undesirable Trees in Bearing 



Orchards 84 



The Selection and Care of Bud Wood . 85 



Summary . , . i 87 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1920 



