BLUE MOLD DECAY OF DELICIOUS APPLES 



The loss of susceptibility of bruises to decay within ihe 3-day 

 period was probably caused by changes occurring in the injured tissue 

 of the bruised area that rendered this substratum less favorable to 

 fungus infection. Desiccation of the injured tissue may have been 

 a factor in bringing about such a change. 



Table 5. — Relation of time interval between bruising and inoculation of 

 Delicious apples to average diameter of bruises and the development of 

 blue mold infections, harvest of 1949 



Kind and time of treatment 

 (days after harvest) 1 



Average 



diameter 



of bruises 2 



Bruised 



areas 

 infected 



Fruits 

 infected at 

 nonbruised 



areas 



Bruising 



Inoculation 











Centimeters 

 3. 20±0. 04___ 



Percent 

 20.0 

 



Percent 

 





















30. 







3 _ 





2.5 



57. 6 

 







3 



3 



3 



3. 18 ±0. 03___ 



20.0 

 5.0 





3 





10.0 







10 









47.4 

 



5. 



10__ 



10 



3. 19 ±0. 02.__ 



7.9 



10 











10__ 





15. 







17 









30.0 







10.0 



17 



17 



3. 24±0. 03___ 



5.0 



17 









17___ 





20. 







31 





10. 



45.0 







25. 



31 



31 



3. 18±0. 03___ 



5. 



31 









31 





10. 







45__ 









37.5 







10. 



45 __ _ 



45 __. 



3. 22±0. 02___ 



10.0 



45 











45__ 





10.0 







75 









22. 5 

 



5.0 



75 



75 



3. 50±0. 07___ 



5.0 



75 









75 





5.0 



Untreated 



Untreated _ 





















1 20 apples were used in each lot. 



2 2 bruises were produced on each apple bruised. 



Factors Related to Decay Development After Infection 



Maturity 



To determine the effect of maturity and ripeness of apples on the 

 rate of growth of the blue mold fungus in apple tissue, tests were 

 made of the rate of decay enlargement in punctured and inoculated 



