IS 



CIRCULAR 765. U. S. DEPARTMENT OF AGRICULTURE 



part of it is protected by certain organic substances such as plant 

 tissue, it will not be killed by tolerable concentrations of ozone. 



The data for the fruit decay in the regular pack for the two storage 

 seasons are summarized in table S. There was no decay on the Golden 

 Delicious test fruit removed from storage January 15. 1943. and none 

 on the Arkansas test fruit removed from storage' March 3 and April 

 28, 1913. or after 1 week at 70 r F. 



Table S. — Effect of ozone on development of decay in apples stored 



atsr F. 



Fruit affected with — 



Experiment. 



variety, and 



ozone treatment 



Fruit 

 waxed or 

 umvaxed 



Fruit 



Date 



examined 



Mis- 

 cel- 



Blue Side Gray lane- 

 mold rot moid ous 

 de- 

 cays 



All 

 de- 

 cays 



Experiment 1 : 



Golden Deli- Box- Xu vi- 

 cious: es ber 



1.95 p. p. in Unwaxed__ 5 696 



do 5 678 



Delicious: 



1.95 p. p. m do 6 613 



do 6 658 



York Imperial: 



1.95 p. p. m do S 763 



do 6 546 



Winesap : 



1.95 do 6 870 



do 6 875 



Experiment 2: 1 



Delicious: 



3.25 p. p. m do 5 534 



do 5 532 



Winesap: 



3.25 p. p. m___ Waxed 4 636 



do 3 497 



3.25 p. p. m___ Unwaxed__ 2 306 



do 1 131 



3.25 p. p. m___ Waxed 4 591 



do 3 452 



3.25 p. p. m___ Unwaxed__ 2 290 



do 1 123 



Mar. 17 

 __do___ 



May 13. 



__do___ 



__do___ 

 __do___ 



^_do___ 

 __do___ 



Mar. 4_ 

 __do.L_ 



May 24 

 __do___ 

 __do___ 

 __do_- 

 Mav 31 

 __db___ 

 __do_._ 

 __do-- 



Per- Per- Per- Per- Per- 



a at c< Hi ci nt cent cent 



1. 1 1. 1 



1. .4 . 6 2. 



8. 3 .30 3. 1 11. 7 

 5. .4 . 6 3. S 9. 8 



2. 7 1. . 2 3. 6. 9 

 2. 7 . 7 3. 7 7. 1 





 .20 .2 



3. 2 



4. 3 



i. o 

 . 4 



1. 2 











1. 



5. 

 5. 6 .60 

 . 3 

 .7 







1. 3 



2. 3 . 

 6.7 



9 10. 6 



3 3. 4 



7. 3 



4. 7 



5. 6 



5.8 

 7. 4 

 1. 6 

 3. 8 

 7. 9 

 11. 5 

 3.7 

 7.3 



1 Golden Delicious apples were removed from storage Jan. 15. and Arkansas 

 apples were examined Mar. 3 and Apr. 28 after 7 days at 70° F. Xo decay was 

 found in either variety on these dates. 



- After 1 week at 70° F.; percentages include decay present on May 24. 



EFFECT OF OZONE OX DEVELOPMENT OF SCALD 



The Arkansas variety was selected to determine the effects of ozone 

 on scald development because of its extreme susceptibility to that dis- 

 order. The experimental fruit was sorted into highly colored ( red) 

 and green lots. Fruit with more than 50 percent of the surface green 



