OZONE IN RELATION TO STORAGE OF APPLES 



15 



Table 6. — Effect of ozone on development of decay on wounded apples 

 inoculated with spores of Penicillium expansum and subsequently 

 stored in ozonized rooms at 31° F. for various period* 



[Final examination of fruit made after 1 to 5 days at 70° F. without ozone to 

 simulate marketing period] 



Variety and ozone 

 treatment 



Home Beauty: 



3.25 p. p. m 







3.25 p. p. m 



0__ 



3.25 p. p. m 



0__ 



3.25 p. p. m 







York Imperial: 



Experiment 1 : 



1.95 p. p. m 







Experiment 2: 



3.25 p. p. m 







3.25 p. p. m 







3.25 p. p. m 







3.25 p. p. m 







3.25 p. p. m 







3.25 p. p. m 







Stor- 



Subse- 









age 



quent 



Fri 



Inocu- 



pe- 



pe- 





in 



lation 



riod at 



riod at 





test 



wounds 



31° F. 



70° F. 













Num- 



Num- 



Days 



Days 





her 



ber 



\ 30 



5 



1 

 1 



8 

 8 



64 

 64 



} 60 







{ 



566 

 555 



4, 528 

 4,440 





1 



{ 



200 



1, 600 



191 



1, 528 



]• 63 



3 



f 



366 



2, 928 



I 



364 



2, 912 



} 30 



2 



{ 



67 

 65 



804 

 780 



} - 







( 



6 

 6 



48 

 48 



} 20 







{ 



6 

 6 



48 



48 



} 30 



1 



{ 



12 

 12 



90 

 96 



} 30 



3 



{ 



12 



12 



90 

 96 



I - 







{ 



139 

 137 



1, 112 

 1, 096 



} 52 



1 



{ 



139 

 137 



1, 112 

 1,096 



Wounds infected 



Decay 



Nor- 

 ma! 



Nw 



34 



33 



249 



332 



2, 225 

 1,405 



0) 



72 

 38 

 86 

 448 

 827 

 906 

 923 



Re- 

 tarded 



Ahi ru- 

 ber 

 24 

 7 

 1,016 

 151 



38 



15 



48 



8 



308 



83 











Total 



Per- 

 cent 



90 

 62 

 27 

 10 

 60 

 23. 

 76. 

 48. 2 



93. 3 



82. 



83. 3 

 95. 8 

 97. 9 

 97. 9 

 52. 2 

 90. 6 

 95. 6 

 97. 9 

 68. 



83. 

 81. 5 



84. 2 



1 No segregations made. 



The ozonized and nonozonized lots of York Imperial, a variety not 

 as sensitive to ozone injury as Rome Beauty, exhibited no marked 

 differences in decay development, As shown in table 6, 93.3 percent 

 of the inoculated wounds on York Imperial apples stored for 30 clays 

 in an atmosphere containing 1.95 p. p. m. of ozone developed into 

 active decay as compared with 82 percent of those on the nonozonized 

 fruit. In another lot stored for 30 days at 31° F. in an ozone concen- 

 tration of 3.25 p. p. m. and then for 3 days at 70° without ozone, 95.6 

 percent of the wounds on inoculated fruit developed into decays as 

 compared with 9T.9 percent of the wounds on the nonozonized fruit. 

 When a third lot of this variety was held for 52 days at an ozone con- 

 centration of 3.25 p. p. m., 81.5 percent of the wounds developed into 

 active decays as compared with 84.2 percent of the wounds on non- 

 ozonized fruit. 



