62 



BULLETIN 815, U. S. DEPAETMENT OF AGRICULTURE. 



Table XIII.- — Average number of seeds per fruit picked from lemon trees of the various 

 strains of the Lisbon variety in the investigational performance-record plat during 

 each month of the 3-year period from July, 1913, to June, 1916, inclusive. 



[The trees of the Bull strata and three other trees, indicated in Table I, were added to the plat in 1914, 

 so that the records here presented for those trees cover the 2-year period from July, 1914, to June, 1916, 

 - inclusive.] 



Num- 

 ber 

 of 

 trees. 



Description of trees. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



Jan. 



Feb. 



Mar. 



Apr. 



May. 



June. 



For 



the 



period. 



77 



Open strain 



5.20 



4.96 

 4.92 

 4.95 

 4.98 

 3.43 



3.04 



2.29 



4.73 



4.13 

 4.60 

 4.80 

 2.79 

 3.60 



3.47 



2.24 



4.50 



4.44 

 4.26 

 4.33 

 3.73 

 1.75 



3.21 



2.62 



4.00 



5.05 

 3.95 

 4.45 

 4.03 

 3.14 



2.06 



1.73 



5.45 



4.24 

 4.64 

 3.58 

 2.69 

 3.69 



2.30 



.68 



5.01 



4.45 

 4.42 

 3.63 

 3.34 

 3.46 



2.45 



1.73 



5.33 



3.87 

 4.78 

 4.14 

 4.05 

 3.52 



2.39 



1.15 



4.99 



4.14 

 4.53 

 4.09 

 4.41 

 3.71 



2.08 



1.00 



5.46 



4.93 

 4.95 

 4.36 

 4.84 

 3.00 



3.20 



1.63 



5.57 



3.60 

 4.60 

 3.53 

 3.12 

 3.75 



L90 



.52 



5.38 



5.77 

 6.03 

 5.11 

 5.53 

 2.60 



2.40 



1.56 



5.73 



5.73 

 5.23 

 4.81 

 5.59 

 2.29 



2.62 



1.92 



5.07 



10 

 121 



Highest producing (ir- 

 respective of strata) . . 

 Entire plat 



4.69 

 4.67 



22 



Lisbon strain 



4.39 



11 





4.24 



3 



Sporting strain 



3.09 



10 

 8 



Lowest producing (ir- 



• respective of strain) . . 



Dense - Unproductive 



strain 



2.61 

 1.67 









COMPARATIVE VALUE OF THE STRAINS. 



The individual-tree performance-record studies of the Lisbon 

 lemon variety have shown that only two strains are of commercial 

 value. These are the Lisbon strain and the Open strain. Trees of 

 the Lisbon strain are very productive and commonly bear most of 

 their crop during the spring months. The trees are hardy and more 

 or less resistant to unfavorable climatic conditions. For this reason 

 in particular the Lisbon strain seems to be well adapted for locations 

 exposed to strong winds or where high or low temperatures or other 

 extreme climatic influences are likely to affect the production of 

 the trees. 



The production of heavy crops by the trees of the Lisbon strain 

 under normal conditions during the early spring months frequently 

 necessitates holding much of the fruit in storage until the la.te summer 

 or fall. However, the vigorous growth characteristic of the trees, 

 the protection of the lemons in the trees by the rather dense foliage, 

 and the fine quality of the fruits are factors which must be taken into 

 consideration by citrus growers. 



The trees of the Open strain of the Lisbon variety have the habit 

 of producing more or less regular crops throughout all seasons of the 

 year. While this characteristic is not so marked as in the case of 

 the trees of the Eureka strain of the Eureka variety, it is very strik- 

 ing when compared with the behavior of the trees of the Lisbon 

 strain. The crops from the trees of the Open strain, while not as 

 great as those of the Lisbon strain for the entire year, are likely to 

 be more valuable, because they are produced more heavily during 

 the seasons when the market is usually the best and lemons bring 

 the highest prices. The fruits of the trees of the Open strain are 

 not as well protected from sun and temperature injuries, nor are the 



