90 The Philippine Journal of Science 1921 
TABLE 4.—Number of trees affected with mottled leaf on calamondin stocks. 
Calamondin stock budded with— tom ecole th 
Number.| Per cent. 
Calanionditt. ssisarcs nana Sas sph cee Boa ax Scans 6 0 0.00 
Cabuyeo 5 bese ee 2 0 0. 00 
RUC ORT ee ee es sa 3 0 0.00 
PNG@ek Gaidines so. cdo s a LE es 2 0 0.00 
NSERIIIIUS Soa ee ee a 22 2 9.09 
DERMIS OORT Bd es a 113 ll 9.78 
RM se es ee 24 8 12.50 
Went Demme's Coe Se 93 12 12.90 
pg cE Se Se BOSS Stic a SOSRRU RCA oe rs SgeaEI 11 | 18.18 
WOOO sik heer cc rs sonnet conto Shee es aoe e ss ho 22 4 18,18 
TABLE 5.—Number of citrus trees affected with mottled leaf on mandarin 
orange stocks. 
Mandarin orange stock budded with— col. aoe 
Number.| Per cent. 
CRNOINRS S B a RER god: Bees i sigh) 14 0 0.00 
TNE ORRIN i siti sca ld 10 0 0.00 
ROPOEM WINN ieee Ss gtga aan 84 0 0.00 
ERGO 62sec RS SS Se SINS GT 8 0 0.00 
Panic. oasis ieee Ses 68 0 0.00 
Grapefruit... we 10 0 0.00 
MAUORIE WEN te a ss a 138 2 1,44 
Sweet orate 222s 70 3 4.28 
Lemon ebucsmadurweininecaw GG | 63 | 17 | 26. 98 
Previous work on this subject has offered little opportunity 
for a comparison between the various citrus species as to their 
_ susceptibility to mottled leaf; the above tables will indicate such 
comparative susceptibility in a general way. Although it will 
be impossible to arrange the species in the order of susceptibility 
(from these tables at least), still it can be said that the calamon- 
din and the lime exhibit the mottled leaf symptoms but slightly; 
and that the tangelo, sweet orange, and mandarin orange varie- 
ties are most commonly affected by mottled leaf. 
The relationship of the stocks to mottled leaf is indicated in 
the foregoing tables by comparison of the figures in the various 
tables for a given species; as, for instance, the sweet orange, 
which is recorded in all of the tables. Thus, the sweet orange 
on pummelo stock developed 191 cases of mottled leaf of a total 
of 223 trees so propagated, or 85.65 per cent of positive cases. 
Sweet orange propagated upon cabuyao stock developed 5 cases 
of mottled leaf from a total of 19 trees budded on cabuyao, or 
26.31 per cent. Sweet orange on sour orange stock developed 
