1. Postharvest disorders
Prepared by: Hamid Salari
Assistant professor
Department of Horticulture

2. Disorder
Tissue breakdown that is not caused by pathogen or mechanical damage.
Increase susceptibility to pathogen
They are due to:
Unfavorable weather
Nutrient deficiency
Stress condition

3. Unfavorable weather

4. Low temperature breakdown
Flesh browning
Usually moist
No external symptoms

5. Internal browning
Low temperature
No external symptoms

6. Senescence breakdown
Browning and breakdown of the tissue under the skin
Often darkens the skin
Whole fruit may become dry
Caused by:
Advanced maturity
Extended storage
High storage temperature
High humidity

7. Soft scald Irregularly shaped smooth brown areas on the skin
Induced by low temperature

8. Water core Water soaked areas inside the flesh
Advanced maturity promotes water core

9. Nutrient deficiency

10. Lenticels breakdown Nutrient imbalances Advanced maturity
Deep black spots

11. Bitter pit
low Ca disorder
dark, sunken lesion at or beneath surface

12. Blossom end rot
Ca deficiency

13. Fruit cracking
Boron deficiency

14. Whiptail
Molybdenum deficiency

15. Stress condition

16. External CO2 injury
Brown lesions on the skin

17. Internal CO2 injury Brown necrotic core External appearance is normal
Injury is caused when fruits are returned to normal conditions

18. Low O2 injury Purpling and discoloration of the skin
Alcoholic odors and flavour
Water soaked lesions on the skin
O2 less than 2%

19. Core browning Brown flesh around the core
Develops after several months of cold storage
Caused by:
advanced maturity
Delayed cooling
Low O2 atmosphere (less than 2%)

20. Superficial scald Browning or bronzing of the skin
Develops several months later in cold storage
Aggravated by delayed cold storage and CA establishment

21. Thank you