62 BULLETIN 815, U. S. DEPARTMENT OF AGRICULTURE. 
Taste XIII.—Average number of seeds per fruit picked from lemon trees of the various 
strains of the Lisbon variety vn the investigational performance-record plat during 
each month of the 3-year period from July, 1913, to June, 1916, wnclusive. 
[The trees of the Bull strain and three other trees, indicated in Table I, were added tothe plat in 1914, 
so that the records here presented for those trees cover the 2-year period from July, 1914, to June, 1916, 
inclusive.] - 
For 
ber Description of trees. |July.| Aug.|Sept.| Oct.|Nov.| Dec.| Jan. |Feb. |Mar. |Apr. |May.| June.| the 
rote period. 
Wie), Openistrainea: epee 5. 20} 4.73) 4.50) 4.00} 5.45) 5.01) 5.33] 4.99) 5.46} 5.57) 5.38) 5.73} 5.07 
10 | Highest producing (ir- 
respective of strain) ..| 4.96] 4.13} 4.44] 5.05) 4.24! 4.45) 3.87) 4.14] 4.93] 3.60] 5.77] 5.73) 4.69 
(2tNeEmtireplat.-25. 52556. = 4.92) 4.60] 4.26) 3.95} 4.64] 4.42) 4.78] 4.53] 4.95) 4.60) 5.03} 5.23] 4.67 
22 | Lisbon strain...........| 4.95) 4.80) 4.33) 4.45) 3.58) 3.63) 4.14) 4.09] 4.36) 3.53} 5.11) 4.81) 4.39 
ih} ipl sub SS ooeocas 4.98) 2.79) 3.73] 4.03) 2.69] 3.34) 4.05) 4.41) 4.84) 3.12) 5.53) 5.59) 4.24 
3 | Sporting strain.........| 3.43} 3.60} 1.75) 3.14) 3.69) 3.46) 3.52) 3.71) 3.00) 3.75) 2.60) 2.29) 3.09 
10 | Lowest producing (ir- 
respective of strain) . .| 3.04] 3.47} 3.21] 2.06] 2.30) 2.45) 2.39] 2.08] 3.20} 1.90) 2.40) 2.62} 2.61 
8 | Dense - Unproductive 
ASCEALM A Paes see 2.29) 2.24) 2.62) 1.73] .68) 1.73) 1.15] 1.00) 1.63) .52) 1.56) 1.92) 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 late 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 
ereat 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 
