76 



BULLETIlSr 813, U. S. DEPAKTMENT OF AGRICULTXJKE. 





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Table XVII gives the average weight per fruit of lemons of the 

 Green and Tree-Ripe grades produced by the trees of the various 

 strains of the Eureka variety during the 6-year period. The data for 

 the two grades combined is shown graphically in figure 15. Many of 



the fruits of the 

 Tree-Ripe grade are 

 picked before they 

 reach the size at 

 which the Green- 

 grade fruits are 

 picked; hence, their 

 average weight is 

 less than that of the 

 Green-grade fruits. 

 Throughout the 

 progress of these 

 studies the fruits of 

 the Pear-Shape 

 strain have been 

 recognized as de- 

 cidedly slow growing, especially in view of the light production of 

 the trees of that strain.' The trees of the Dense-Unproductive and 

 the Shade-Tree strains are not only low producers, but are also very 

 vigorous growing, and their fruits are shown to be above the average 

 of the other strains in weight, as would be expected. 



Table XVII . — Average weight jyer fruit for lemons of the Green and Tree-Ripe grades 

 produced by the trees of the various strains of the Eureka variety in the investigational 

 performance-record plat during the 6-year periodfrom July, 1911, to June, 1917, inclusive. 



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Fig. 15. — Diagram showing the average weight per fruit of the Green 

 and Tre e-Eipe grades from the trees of the various strains of Eureka 

 lemons occurring in the investigational performance-record plat 

 for the 6-year period from July, 1911, to June, 1917, inclusive. 



Num- 

 ber 

 of 

 trees. 



Description of trees. 



Average weight per frnit 

 (ounces). 



Green 

 grade. 



Tree-Ripe 

 grade. 



Both 



2 

 76 

 10 

 117 

 10 



2 



10 

 10 

 17 



Pear-Shape strain 



Eurelja strain 



Small-Open strain 



Entire plat 



Highest producing (all Eureka strain). . . 



Dense-Productive strain 



Lowest producing (irrespective of strain) 



Dense-Unproductive strain 



Shade-Tree strain 



4.270 

 4.273 

 4.275 

 4.295 

 4.280 

 4.318 

 4.377 

 4.411 

 4.391 



3.194 

 3.476 

 3.513 

 3.483 

 3.490 

 3.470 

 3.546 

 3.575 

 3.624 



3.790 

 4.012 

 4.048 

 4.050 

 4.059 

 4.113 

 4.214 

 4.244 

 4.271 



Figure 16 illustrates graphically the variations in the average seed 

 content of the fruits from the lemon trees of the different strains of 

 the Eureka variety in the investigational plat. It is shown that the 

 fruits of the Eureka strain contain on the average 7.1 seeds per 

 fruit, which is more than was found in the fruits of any other strain. 

 The fruits from the undesirable Shade-Tree and Dense-Unproductive 



