106 
BULLETIN 697, U. S. DEPARTMENT OF AGRICULTURE. 
ing trees bore approximately twice the crop that was borne by the 
lowest producing trees. The great difference in production from the 
trees on the two plats is largely accounted for by the difference in the 
ages of the trees. The difference in the value of the crops from the 
highest and lowest producing trees serves to emphasize the desira- 
bility of propagating only from trees with known records of heavy and' 
valuable production. 
p/vp m/ffsr p/iODi/c/m r/tffs 
PPP CPNT Of CPOP BY WP/6//P 
s/zrs 
22.0 
//2 
2/J 
/as 
36 
/0.7 
14.4 
80 
/2.S 
MJ 
64 
/S.6 
/OS 
48 
/2.3 
8.7 
32 
9.7 
/S.O 
24 
GRADES 
tSJ 
P/VP LOWPST PPOPL/Cm TPPPS 
PPP CPA/P OP CPOP BY WP/G//T 
64.3 P/RST 67.4 
3/.S> 
S.7 
SECOND 28.8 
CULL 6.2 
Fig. 12. — Average annual production by commercial sizes and grades from the five highest and the five 
lowest producing Marsh grapefruit trees, irrespective of strain, in the investigational performance- 
record plat B in a grove planted in the fall of 1903. The figures indicate the proportion of each size 
and grade to the total crop, calculated from their weights during the 6-year period, 1910 to 1915, 
inclusive, except that the data relating to culls cover only the 4-year period, 1912 to 1915, inclusive. 
COMPARATIVE VALUE OF THE STRAINS. 
The Marsh is the most productive and most valuable strain within 
the Marsh variety. The flattened shape of the fruits, the smooth 
texture and waxy-white color of the rind, the abundance of juice 
of high flavor and fine quality, the commercially seedless condition of 
the fruits, and other characteristics, all combine to make them 
of superior value. The regular, heavy production of the trees under 
favorable conditions makes this strain one of the most stable and 
profitable of any of the citrus fruits in California. The increasing 
price paid for ripe fruits of this strain in many important markets 
during recent years is proof of their superior value. It would seem 
advisable to eliminate all other strains and varieties and grow only 
the Marsh strain in all commercial grapefruit orchards in California, 
The seedy strains are undesirable, and the presence of even occa- 
sional fruits of this character in the crops is detrimental to the repu- 
tation of the variety. Because the fruits of the Smooth Seedy strain 
