Disorder

1
Disorders in Mango
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2
Mango disorders
Fruit Drop
Malformation
Black Tip
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3
Malformation
Vegetative malformation
Floral malformation
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4
Vegetative malformation
The vegetative malformation generally
affects seedlings of  young plants in
which there is a swelling of buds.
Distorted leaf bud
It leads to formation of small cluster with short
internodes at the apical portion and give an
appearance of witches broom like structure.
Normal leaf bud
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Floral malformation
Malformed panicles have bigger florets than
normal florets and contain mostly male flowers.
Distorted florets
Normal floret
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Floral malformation
Symptoms
Distorted panicles and florets
Short axis
Thick rachis
Cluster like inflorescence
Floral malformation
Dwarfed leaf growth
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Floral malformation
Management practices
Remove the malformed panicles as they appear on
the tree
Spray 200 ppm of NAA once in October.
Floral malformation
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8
Fruit drop
Fruit drop is natural in mango.
But, some times the fruit drop will be very
heavy, even up to 99, at various stages of
fruit growth.
The intensity of fruit drop varies from variety
to variety.
Among the commercially grown varieties, Langra is
more susceptible to drop, while Dasheri is the
least.
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Fruit drop
The fruit drop is more or less a continuous
process and can be classified into three phases,
viz. (i) pinhead drop, (ii) post-setting drop and
(iii) May-month drop.
The fruit drop in first two phases are
insignificant compared to the third phase which
affects the final yield significantly and needs
more attention.
Embryo abortion, climatic factors, disturbed
water relation, lack of nutrition, attack of
diseases and pests and hormonal imbalances are
the major factors that lead to fruit drop.
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10
Fruit drop
Management practices
Regular irrigation during the fruit setting and
development can reduce fruit drop considerably.
Foliar applications of bio-regulators such as NAA
at 20 ppm or Alary (B- nine) at 100 ppm about 6
weeks after fruit set reduce fruit drop
considerably.
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11
Black tip
Black tip is a serious disorder that is capable
of causing considerable set back to the grower.
Among the commercial cultivars, Dasheri is most
prone to the disorder, while Lucknow Safeda is
least.
Black tip disorder has generally been detected in
orchard located in the vicinity of brick kilns.
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Black tip
Symptoms
The damage to the fruit gets initiated right at
marble stage with a characteristic yellowing of
tissues at distal end.
Gradually, the color intensifies into brown and
finally black.
At this stage, further growth and development of
the fruit is retarded and black ring at the tip
extends towards the upper part of the fruit.
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Black tip
Management practices
Irrigation, condition of the tree and management
practices play important role in deciding the
severity of the disorder.
Planting of mango orchards in North-South
direction and 5 to 6 km away from the brick kilns
may reduce incidence of black tip to a greater
extent.
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14
Black tip
Management practices
Irrigation, condition of the tree and management
practices play important role in deciding the
severity of the disorder.
The incidence of black tip can be minimized by
the spray of borax (1) or other alkaline
solutions like caustic (0.8) or washing (0.5)
soda.
The first spray of borax should be done
positively at pea stage followed by two more
sprays at 15 days interval.
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