Anthracnose of Mango: Symptoms, Management

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Causal Organism: Colletotrichum gloeosporioides

Symptoms:
The fungus attacks the young leaves, stem, inflorescence and the fruits, the damage being maximum when the fruits are attacked. Small brown spots appear on the leaves and inflorescences. Twigs show dieback symptoms. Flowers inflorescence is infected. When the fruits are attacked, black, round or irregular sunken spots are formed and the skin becomes discolored Older infected fruits rot and decay.

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Etiology:
Mycelium is septate. Acervuli develop profusely in diseased parts of the plant. Theconidia in mass are pinkish but hyaline individually. Conidia are straight, cylindrical or oval,hyaline, single celled with round ends and sometime contain one or two oil globules.

Perpetuation:
Infected plant parts (diseased twigs, leaves, and fruits) are the primary source of infection. Secondary spread is through airborne conidia.
The optimum temperature for infection was found to be 25 C and relative humidity from 95-97 %.

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Management:
1. Spraying Bordeaux mixture (1%) or copper oxy-chloride 50 WP (0.25%) or Carbendazim 50 WP (0.1%) or Captan (0.2%) at 15 days interval until harvesteffectively controls anthracnose.
2. Before storage, dip fruits in Carbendazim 50 WP solution 0.05 % ie, 5g/10 litres of water) for 5 minutes.