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

Fig. 5. Effect of sunburn browning and sunburn necrosis on electrolyte leakage (relative electrical conductivity) from peel of three apple cultivars. Bars 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