52 BULLETIN 815, U. S. DEPARTMENT OF AGRICULTURE. 
Table VI presents the average annual yield of the lemon trees of 
the various strains of the Lisbon variety in the investigational plat, 
showing their total crops and the yields of Green, Tree-Ripe, and Cull 
fruits. Figure 4 shows these data graphically, and the percentage of 
fruit of each grade is shown in Table VII. The Lisbon strain is seen 
to be the most productive one. The Buii strain is very nearly as 
productive and bore a higher proportion of green fruit, but the lower 
quality and poor appearance of the fruit of that strain make it much 
less desirable than that of the Lisbon strain. The low average of 
the Dense-Unproductive strain and its high percentage of Green-grade 
ruit is particularly noticeable. Every tree of this strain produced 
more fruit of the Cull grade than of the Tree-Ripe grade. The fruit 
borne by the trees of this strain is.of very little value commercially. 
The trees of all the strains except the Open strain are characterized 
by a dense or semidense habit of growth, and-the effect of this con- 
dition is reflected in the percentage of fruit of the Cull grade produced 
TALES FOL CYOFP ORL’ GRADE THELAWE GHD Cll GRADE 
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(PREDICTIVE DO STPALY) 
22 LISLE STHEULG 622 72 Ee ee SLE) EEE 64/S@@m 532528 
“BALL STAY 663 (EEE eee SSS 32 SES of ee ‘77238 
S SOTIWNVE STL A ES ee ee A 7 FEES Eee 5202 A L25/@B 
42 LMITTRE FLAT OEE EEN I TE 2562 SSS 932/ Gm S259 
77 BEV STAAU/S 25 05 Fee FE 7 EE Msé@mmE SoCER 
L6 LOWEST PROLLY E 20S ee 0072 EEE S78 “7/08 
(G2RESPLTITVE OF STA 
OLE LEZ IVE STIL XE, 7S SC. 2 a SS, | AAleae 
Fig. 4.—Diagram showing the average annual total cropsand the weight of fruit of the different commer- 
cial grades produced by the trees of the several strains of the Lisbon lemon occurring in the investiga- 
tional performance-record plat during the 4-year period from July, 1913, to June, 1917, inclusive. The 
data for the trees ofthe Bullstrain and three other trees, as indicated in Table I, cover only three years. 
The strains are ranked according to the weight of their average total crops. 
by the trees of the different strains. Table VII shows the trees of 
the Open strain to have had 11.8 per cent of fruit of the Cull 
orade, the next highest proportion, 5.16 per cent, bemg borne by the 
trees of the Dense-Unproductive strain. 
The last two columns of Table VII show the average number and 
percentage cf variable fruits produced by the trees of the different 
strains during the performance-record period. While all except the 
Open strain are shown to bear very large percentages of fruit. of 
variable forms, the greater proportion of them on the trees of the 
Bull, Lisbon, and Open strains are of the fluctuating type previously 
described. The fruits of the Dense-Unproductive strain are prac- 
tically all of forms characteristic of that strain, and the trees of the 
Sporting strain produce a relatively large percentage of fruit which 
differs very markedly from the typical fruit of the variety. Figure 
5 shows graphically the variations between the different strains in the 
percentage of variable fruit produced. 
As << oe? 2 oe ee 
