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Cabbage diseases – Kisan Suvidha
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Cabbage diseases

cabbage diseases

Cabbage diseases

Major Cabbage diseases are given below:-

1.Black leg: Phoma lingam

black leg disease of cabbage

Symptom:
  • It is caused by Phoma lingam and occurs in most regions, especially in areas with rainfall during the growing period.
  • The fungus is carried by the seed and hence it may occur from the early stage.
  • The stem of the affected plant when split vertically, shows severe black discoloration of sap stream. Whole root system decays from the bottom upwards.
  • Frequently, the affected plants fall over in the field.
Management:
  • Seed infection can be prevented by spraying the seed plants with copper oxychloride or with an organic mercuric compound.
  • Seed treatment with Captan or Thiram 4g/kg of seed, followed by seed treatment with Trichoderma viride 4g/kg.
  • Pusa Drumhead, a cabbage cultivar has been reported to be tolerant under field condition.

 

2.Downy mildew: Peronospora parasitica

cabbage downey mildew

Symptom:
  • It may attack young plants and also at the seed production stage as being commonly observed in northern India in recent years when high humidity prevails during seed production stage.
  • The fungus when attacks the young seedlings, discoloration occurs and in severe cases, the whole plant perishes.
  • Purplish leaf spots or yellow brown spots on the upper surface of the leaf appear while fluffy downy fungus growth is found on the lower surface.
Management:
  • Seed treatment with Metalaxyl (Apron 6g/kg of seed )
  • Foliar spraying with Metalaxyl (Ridomil) 0.4%.

 

3.Root rot: Rhizoctonia solani

cabbage root rot

Symptom:
  • Young plants show soft, water soaked lesion on the stem near soil level, the cotyledons wither and the plant eventually falls over and perishes.
  • When infection occurs at a later stage of growth, the lower part shows discoloration over a length of several centimetres, becomes hard and woody, and thinner than usual as the cortical tissue dies and this phenomenon is known as wire stem.
Management:
  • Nursery beds: Soil drenching with Methyl bromide @ 1 kg/10 m 2 and covered with polythene sheet.
  • Seed treatment with Captan/Thiram 4g/kg, followed by seed treatment with Trichoderma viride 4g/kg.

 

4.Black spot: Alternaria sp.

Cabbage black spot

Symptom:
  • In older plants, leaves, petioles, and stems small, brown to black circular to slightly elongated spots appear. Sometimes the spots join together.
  • It causes damage to cabbage heads and cauliflower curds after maturity and during seed production stage.
Management:
  • First foliar spraying with Tridemorph 0.1% followed by spraying with Mancozeb 0.25% a month interval.

 

5.Clubroot: Plasmodiophora brassicae

Symptom:
  • Stunting and yellowing of plants
  • Leaves become yellowish and wilt on hot days.
  • Clubs like swelling of root and root lets
  • Club root is particularly prevalent in soils with a pH below 7, whereas it has been observed that the disease is often less serious on heavy soils and on soils containing little organic matter.
Management:
  • Soil fumigation with Methly bromide 1kg/10m 2  followed by covering with plastic film.
  • Seed treatment with Captan/Thiram 4g/kg, followed by T.viride 4g/kg.
  • Application of lime 2.5 t/ha.
  • Soil drenching with Copper oxychloride 0.25%.

 

6.Powdery mildew: Erysiphe polygoni

cabbage powdery mildew

Symptom:
  • Initially, white tufts of mould arise on the upper surface of the leaves and later run together and the entire leaf becomes covered with greyish white mycelium.
Management:
  • Spary inorganic sulphur 0.25% or Dinocap 0.05%.

 

7.Damping off: Pythium  debaryanum

cabbage damping off

Symptom:
  • Black and reddish brown lesion on the collar region. Finally, infected seedling is toppled on the ground surface.
  • The disease is promoted by high humidity and high temperature and the damage in the seed bed, in general, is considerable.
Management:
  • Seed treatment with Captan/Thiram 4g/kg, followed by seed treatment with T.viride 4g/kg.

 

8.Black rot: Xanthomonas campestris pv. campestris

cabbage black rot

Symptom:
  • The infection of the foliage results in yellow ‘V’ shaped spots arising along the margin which extends in the direction of the midrib.
  • These spots are associated with a typical black discoloration of the veins.
  • The infection extends through the xylem to the stalk and the vascular bundles turn black. In severe infection, the whole leaf shows discoloration and eventually falls off.
Management:
  • Seed treatment with Aureomycin 1000ppm for 30 min is effective in killing both the internally and externally seed-borne pathogen.
  • Drenching the nursery soil with formaldehyde 0.5% helps in checking the disease.
  • Application of bleaching powder at 10.0 to 12.5 kg/ha controls the disease.

 

 

Source-

  • TamilNadu Agritech Portal

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