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Apple diseases – Kisan Suvidha
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Apple diseases

apple diseases

Apple diseases

Major Apple diseases are given below:-

1.Apple Scab: Venturia inaequalis

Apple Scab
Symptom:
  • Symptom appears on leaves and fruits.
  • On the lower side of the leaf, the lesion appears as olivaceous spots which turn dark brown to black and become velvety.
  • On young foliage, the spots have a radiating appearance with a feathery edge.
  • On older leaves, the lesions are more definite in outline.
  • The lesion may form a convex surface with the corresponding concave area on the opposite side.
  •  In severe infection leaf blade curved, dwarfed and distorted.
  • Fruits show small, rough, black circular lesions.
  • The centre of the spots become corky and on mature fruits, yellow halo is seen around the lesions.
Management:
  • Clean cultivation, collection and destruction of fallen leaves and pruned materials in winter to prevent the sexual cycle.
  • Spray Tridemorph 0.1% before flowering.
  • Spray Mancozeb 0.25 % at bearing stage.
  • Spray 5 % urea prior to leaf fall in autumn and 2 % before bud break to hasten the decomposition of leaves.

S.No

Tree stage

Fungicide/100lit

1

Silver tip to given tip

Captafol 200 gm (or) Captan 300 g or Mancozeb 400 g

2

Pink bud or 15 days after 1 st  spray

Captan 250 g or Mancozeb 300 g

3

Petal fall

Carbendazim 50 g

4

10 days later

Captan 200 g.or Mancozeb 300g

5

14 days after fruit set

Captofol 150 g

  • Add stickers – teepol or triton 6 ml/10 lit of spray fluid.

 

2.Powdery mildew: Podosphaera leucotricha

powdery mildew of apple

Symptom:
  • Small patches of white powdery growth appear on the upper side of leaves.
  • In a severe case, the symptom appears on both the sides.
  • Twigs are also infected. Affected leaves fall off in severe infection.
  • Fruit buds are also affected and deformed or remain small.
Management:
  • Spray Dinocap 0.05% or Chinomethionate 0.1%

 

3.Fire blight: Erwinia amylovora

apple fire blight

Symptom:
  • The initial symptom usually occurs on leaves, which become water soaked, then shrivel turn brownish to black in colour and fall or remain hanging in a tree.
  • The symptom spread to twigs. Terminal twigs wilt from tip to downward and also spread to branches.
  •  Fruits become water soaked, turns brown, shrivels and finally becomes black.
  • Oozing may be seen in the affected area.
Management:
  • Removal and destruction of affected parts.
  • Removal of blighted twigs
  • Spray with Streptomycin 500 ppm.

 

4.Soft rot: Penicillium expansum

Soft rot of Apple

Symptom:
  • Young spots start from stem end of the fruit as light brown watery rot. As the fruit ripens  area of the rotting increases,
  • Skin becomes wrinkled.
  • A peculiar musty odour is emitted
  • Under the humid condition, a bluish green sporulating growth appears.
  • Infection takes place by wounds in the skin caused by insects and during handing in storage and transport
Management:
  • Careful handling of fruits without causing any wounds.
  • Dipping the fruits aureofunginsol @ 500 ppm for 20 min gives the best control.

 

5.Bitter rot: Glomerella cingulata

bitter rot of apple

Symptom:
  • Faint, light brown discolouration beneath the skin develops. The discolouration expands in a cone shape. The circular, rough lesions become depressed. The lesions increased and cover entire areas of fruits.
  • Tiny black dots appear beneath the cuticle which gives rise to acervuli
  • Pink masses of spores are found arranged in defined rings.
Management:
  • Spray Mancozeb 0.25 % in the field.
  • Treatment with Mancozeb 0.25 % to check the disease in storage.

 

Source-

  • TamilNadu Agritech Portal

 

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