68 



BULLETIN 813, U. S. DEPARTMENT OF AGEICULTURE. 



probably due to the closer habit of growth of those trees, which 

 lessens the number of fruits knocked from the trees or marred and 

 scratched by the movement of the branches by the wind. The more 

 compact trees also protect their fruits from sunburn to a greater 

 extent than those of a more open character. 



As shown by the last two columns in Table XII and graphically 

 in figure 11, the fruit produced by the trees of the Eureka strain is 

 more uniform in character than that borne on the trees of the other 

 strains. The 7.68 per cent of variable fruit produced by the trees 

 of the Eureka strain seems large, but the number is much less than 

 was produced by the trees of the other strains, and if the minor forms 

 and fluctuating variations were deducted this percentage would be 

 very greatly reduced. 







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Fig. 11. — Diagram showing the percentages of variable fruits occurring on the trees of the different strains 

 of Etu'eka lemons in the investigational performance-record plat during the 3-year period from July, 

 1914, to June, 1917, inclusive. The proportions are based on the number of fruits produced. 



Table XII. — Production of fruit of the three different grades and of variable fruits picked 

 from the lemon trees of the several strains of the Eureka variety in the investigational 

 performance-record plat during the 6-year period from July, 1911, to June, 1917, inclu- 

 sive. 



[The data for variable fruits cover the 3-year period from July, 1914, to June, 1917, inclusive. The strains 

 are ranked according to their proportion (by weight) of fruit of the Green grade.] 



Num- 

 ber of 

 trees. 



Description of trees. 



Percentage of weight of total 

 crop. 



Variable fruits. 



Green 

 grade. 



Tree-Ripe 

 grade. 



Cull 

 grade. 



Average 



yearly 



number 



per tree. 



Per cent. 



17 



Shade-Tree strain 



80.92 

 76.54 

 76.40 

 71.56 

 67.36 

 66.20 

 65.66 

 62.87 

 57.04 



12.43 

 15.07 

 15.54 

 18.32 

 21.32 

 23.03 

 23.04 

 24.87 

 34.35 



6.65 

 8.39 

 8.06 

 10.13 

 11.33 

 10.77 

 11.29 

 12.26 

 8.61 



99.84 

 69.00 

 68.77 

 1.55. 33 

 148. 53 

 93.77 

 95.68 

 88.16 

 428. 17 



15.90 



10 

 10 



Lowest producing (irrespective of strain) 



Dense-Unproductive strain 



17.38 

 16.40 



2 



Dense-Productive strain 



12.39 



10 

 10 



Highest producing (all Eureka strain) 



Small-Open strain . ... 



9.50 

 9.95 



117 



Entire plat 



9.67 



76 



Eureka strain 



7.68 



2 



Pear-Shape strain 



50.15 









