Food Safety Focus (218th Issue, September 2024) – Article 3

Resin Canal Discolouration in Mangoes

Mangoes are popular fruits in summer. While we are preparing fruit dishes, sometimes brown or black discoloured lines may be found on mangoes. Some may be concerned that the strange appearance of these mangoes could be a sign of fruit spoilage, parasitic infestation or unhealthy growth.

The dark coloured lines found in mangoes are known as resin canal discolouration (RCD), which is a natural phenomenon. RCD can be formed from the fruit skin to the fleshly fruit portion of mangoes. They act as a protective mechanism against pest and pathogen invasion, and also regulate ripening of the fruit.

Mangoes affected by RCD are still fit for human consumption, provided that they are fresh and without spoilage. The trade and the public should obtain fruits from reliable sources, and should adopt good stock management to keep fruits fresh and wholesome for safe consumption.

Figure: Resin Canal Discolouration