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Diseases of Mustard / Rapeseed - Kisan Suvidha
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Diseases of Mustard / Rapeseed

mustard diseases

Diseases of Mustard / Rapeseed

Major diseases of Mustard are:-

1.Sclerotinia Stem Rot: Sclerotinia sclerotiorum

rapeed sclerotinia stem rot
Symptom:
  • The stems develop water-soaked spots which later may be covered with a cottony white growth.
  • As the disease progresses, affected portions of the stem develop a bleached appearance, and eventually the tissues shred.
  • Girdling of the stem results in premature ripening and in lodging of plants.
  • Hard black bodies, the sclerotia, are formed inside the stem and occasionally on the stem surface. Basal stalk infections rarely occur.
  • Yield loss of 10 to15% has occurred in Saskatchewan, Manitoba and North Dakota; occasionally losses of 50% have occurred in Manitoba
Management:
  • Use crop rotation; do not plant highly susceptible crops more than once in four years, including dry edible beans, sunflowers, mustard and canola. Use at least a five-year rotation for severely infested fields.
  • Avoid planting next to a field that had severe Sclerotinia in the past four or five years. Control broad-leaved weeds.
  • Plant thoroughly cleaned seed. Avoid dense stands of canola.

 

2.Alternaria Black Spot- Alternaria brassicae and A. raphan

rapeed alternaria black spot

Symptom:
  • The stems develop water-soaked spots which later may be covered with a cottony white growth.
  • As the disease progresses, affected portions of the stem develop a bleached appearance, and eventually the tissues shred.
  • Girdling of the stem results in premature ripening and in lodging of plants.
  • Hard black bodies, the sclerotia, are formed inside the stem and occasionally on the stem surface. Basal stalk infections rarely occur.
  • Yield loss of 10 to15% has occurred in Saskatchewan, Manitoba and North Dakota; occasionally losses of 50% have occurred in Manitoba
Management:
  • Crop rotation helps reduce disease carry over but does not eliminate airborne spores from another field.
  • Clean seed to remove shrunken seed that may be infected with black spot and have low viability.
  • Use seed with high germination (over 90%). Swath badly infected crops early to minimise shattering losses and seed shrinkage due to black spot.

 

3.Mustard White Rust: Albugo candida

mustard white rust

Symptom:
  • White to creamy yellow pustules develop on the lower leaf surface. The pustules, later coalesce to form patches on the lower leaf surface.
  • Tan-yellow spots develop on the upper leaf surface opposite the pustules.
  • Pustules may also form on the pods. Infected flowers develop a “staghead” in which the flowers are sterile, malformed and green, and various flower parts may be thick and club-shaped and greatly enlarged.
  • Most turnip or Polish varieties of canola, as well as brown and oriental mustard, are susceptible.
  • Yield losses are about 1% for each 1% of staghead observed in a field. Yield losses in Manitoba are usually less than 10%.
Management:
  • Argentine varieties are resistant. If growing Polish type canola, select resistant varieties.
  • See current variety recommendations for information on susceptibility.
  • Use at least a three-year crop rotation. Control volunteer canola and susceptible mustard-type weeds in the rotation.

 

4.Mustard Downy Mildew: Peronospora parasitica

rapeed downy mildew
Symptom:
  • Leaf spots initially are angular, translucent, light green, later developing into grayish-white irregular necrotic (dead) patches.
  • The stems of flower clusters become swollen.
  • Frequently associated with white rust. May develop late in the season on turnip-type (Polish) canola varieties.
Management:
  • Destroy crop refuse; crop rotation.

 

 

Source-

  • TamilNadu Agritech Portal

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