336 The Philippine Journal of Science 1922 
The data contained in Table 3 rather definitely indicate an 
increasing resistance of fruit tissues as they matured. It may 
be stated even more strongly that the tissues became immune 
with maturity. Some of the striking results obtained are shown 
in Plates 1, 2, and 3. 
Paralleling the experiments upon the Washington navel va- 
riety, tests were made upon fruits of the Ikiriki strain of 
the Unshiu (Satsuma) orange (Citrus nobilis var. unshiu.) The 
petals of the blossoms of this variety drop at about the same time 
as those of the Washington navel orange, although the flowers of 
the Unshiu orange sometimes extend a week or ten days later 
TABLE 4.—Results of inoculation with Pseudomonas citri on Unshiu orange 
fruits of various degrees of maturity. 
Fruit. Infections. 
Needle 
i punc- 
No. Age. —— tures. wae aga Not at punctures. 
Days. mm, Per cent. Number, 
3 SE Ue IANS eM NEN Se eR 2 6.4 W |scadictces Fruit dropped. 
Me SR 2 4.8 We conieeceee Do. 
Waa oe 2 8.0 10 10 
eR gl 2 11:2 10 30 
Deas 2 6.4 10 5 
Were 2 8.0 Wi eioresics Fruit dropped. 
et eS Rea se hg 2 9.6 10 15 
Bee 2 12.8 Wetesnseec ses Fruit dropped. 
le So 2c RTE ae See 2 9.6 10 0 
eS Res ee eae 2 8.0 10 5 
Reece = 2 12.8 Ofeacved eas} TE 
Fie setn ie eS 2 9.6 Of ccesuscéxe Numerous. > 
ey nan 2 8.0 Otsersstes 11 
Wines io st 2 9.6 Os oegs one Fruit dropped. 
bn no ee ee 2 9.6 Dees sacs: 9 
ede er ne een 2 12.8 a pee errr 18 
BF esis eae ee g 12.8 fe aa Sesres 3 
Woche: 2 8.0 Wie 5 
Dot ee eS 2 8.0 CaS Fruit dropped. 
ah rene Sit bests 2 9.6 0 Do. 
Soc neem na 2 8.0 gh PPE Ae el None. 
eng ER AEE 2 8.0 1 ease ty Fruit dropped. 
PU iw idsh patichnut swaps cee 2 6.4 DB BER ont oe Do. 
cheater eee eee Mae 2 8.0 9 senesced 2 
ee ce NN 2 8.0 pe een 6 
pudcaeetaesiet oe eae tes 2 8.0 OSE, 8 
WT ous os Sreceteseareensan lescle 2 8.0 Ohi. ries 4 
*As with the Washington navel fruits, it was very difficult to determine for practical 
purposes the stage at which the ovary of the flower became a fruit. In the present case 
fruits 1 to 20 were inoculated but one or two days after the flower petals had fallen. 
» The term numerous was used only in the ease of an observation of a fruit in which 
the cankers were so many as to form a mass of lesions difficult to identify strictly and 
count definitely, oe 
