Two Types of Sunburn in Apple Caused by High Fruit Surface (Peel) Temperature

Fig. 6. Electrolyte leakage (relative electrical conductivity) of apple peel from three cultivars as influenced by incubation temperature for 30 min. Data points for a given temperature with the same letter are not significantly different from each other at P < 0.05 according to Duncan’s Multiple Range Test.



Image from Plant Health Progress article:
Two Types of Sunburn in Apple Caused by High Fruit Surface (Peel) Temperature