Stem End Rot: Lasiodiplodia theobromae

Symptoms

• In fruits, the pericarp darkens near the base of the pedicel.
• The affected area enlarges to form a circular, black patch which under humid atmosphere extends rapidly and turns the whole fruit completely black within two or three days.
• The pulp becomes brown and softer.

Darken pericarp	Circular black patch	severe infection	Infected fruits

Management

• Avoid harvesting immature fruit. Postharvest treatment with hot water and carbendazim (Spin Flo) is partially effective against stem end rot.
• For control of stem end rot during controlled atmosphere storage, a dual treatment of hot carbendazim (Spin Flo) followed by prochloraz is necessary.
• Fruit from orchards with a history of stem end rot losses should be rejected for long term storage. The severity of stem end rot can be assessed as follows.
• Harvest 100 mature fruit at random from throughout the orchard.
• Leave them untreated and store at 25° until they are fully ripe. Ideally, less than one-tenth and certainly no more than one-third of the fruit should develop symptoms of stem end rot by the time they are fully ripe.

Image Source:

S Iram and HMI Ahmad. Major Post Harvest Disease of Mango and their Management. 2013.  Intl. J. Agron. Plant. Prod. 4 (12), pp: 3470-3484.