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UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 815 
Contribution from the Bareau of Plant Industry. 
WM. A. TAYLOR, Chief 
Washington, D. C. PROFESSIONAL PAPER June 1, 1920 
CITRUS-FRUIT IMPROVEMENT 
A STUDY OF BUD VARIATION IN THE 
LISBON LEMON 
By 
A. D. SHAMEL, Physiologist, L. B. SCOTT, Pomolegist, C. S. epee! 
_ Assistant Pomologist, and C. L. DYER, Scientific Assistant, F 
- Improvement Investigations, Office of Horticultural an 
Pomological Investigations : 
rd 
CONTENTS 
Page 
Importance of the Lemon Industry . . Comparative Value of tha Strains. . . 62 
History of the Lisbon Lemon Variety . The Unintentional Propagation of Unde= 
Variability within the Variety . . . sirable Strains. . 2... 2 se 
Objects of the Investigations . . . . The Isolation of Strains through Bud 
Pian of the Investigations ..... Selections. oc cee ew celica (ete 
Methods of Keeping Perfermance Rec- Top-working Undesirable Lemon Trzes . 
MEGS ete a Sees ss Be ees Replacing Undesirable Trees in Beai*as 
Descriptions of the Tapaktaait Strains ‘ Orchards; 426 cise «eo 6 eta 
Lessons Taught by These Investigations 11 | The Selection and Care of Bud Wood . - 
Presentation of Data ....... 12] Summary .. 2. 2. 2 2 ow © 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1920 
