Diseases Of Mango

Diseases of Mango
Anthracnose (Colletotrichum  gloeosporioides)
Symptoms

Produces leaf spots, blossom blight, wither tip, twigs blight and fruit rot. Small blister like spots develop on the leaves and twigs. Young leaves  wither  and dry  Tender twigs wither and die back  symptom appears. Affected branches ultimately dry up. Black spots appear on fruits. The fruit pulp becomes hard, crack and decay at ripening. Infected fruits drop

Mode of survival and spread

on dried leaves, defoliated branches mummified flowers and flower brackets. Contact with diseased fruit during transport and storage. The secondary spread is through  airborne conidia

Favorable conditions

Temperature of 25°C and Relative Humidity 95-97%

Management

Before storage, treat with hot water, (50-55°C) for 15 minutes

Mango malformation  (Fusarium moliliforme var. subglutinans) 

Symptoms

 Three types of symptoms: bunchy top phase, floral malformation and vegetative malformation. In bunchy top phase in nursery bunch of thickened small shoots, bearing small rudimentary leaves.  Shoots remain short and stunted giving a bunchy top appearance. In vegetative malformation, excessive vegetative branches of limited growth in seedlings.  They are swollen with short internodes forming a bunches of various size and the top of the seedlings shows bunchy top appearance. In malformation of inflorescens, shows variation in the panicle.  Malformed  head dries up in black massesa  and persist for long time. Secondary branches are transformed into number of small leaves giving a witches broome appearance.

Mode of spread

Diseased propagatives materials.

Management

Diseased plants should be destroyed Use of disease free planting material Pruning of diseased parts along the basal 15-20 cm apparently healthy portions.

Grey Blight (Pestalotia mangiferae)

Symptoms

Brown spots develop on the margin and at the tip of the leaf lamina.  They increase in size and become dark brown. Black dots appear on the spots which are acervali of the fungus.

Mode of survival and spread

Survive on mango leaves for over a year. Spreads through wind borne conidia.

Favourable conditions

Heavy infection is noticed during the monsoon when the temperature is 20-25oC.and high humidity.

Management

Remove and destroy infected plant parts.

Sooty mould (Capnodium mangiferae)

Symptoms

The fungi produce mycelium which is superficial and dank.They row on  sugary secretions of the plant hoppers.  Black encrustation is formed which affect the photosynthetic activity.

Favourable conditions

The fungus grows on the leaf surface on the sugary substances secreted by Jassids,Aphids and scale insects.

Management

Management should be done for insects and sooty moulds simultaneously.  Starch dries and forms a flake which are removed along with the fungus.