White rust of crucifers

White rust of crucifers:

Causual organism :Albugo candida / Albugo cruciferum

 Class- oomycetes
 Order- Peronosporales
 Family- Albuginaceae
  • White rust is found in number of cruciferous plant like cabbage , turnip, cauliflower, raddish, broccoli, knol khol etc. Albugo candida is an obligate parasite with  intercellular mycelium and also produce knob shaped haustoria. Estimated Loss due to floral infection is  23-54%. Mostly Disease is supposed to occurs in association with downy mildew.

Symptoms of White rust of crucifers:

  • All parts of plants affected except roots
  • Symptoms are divided into Local and systemic on the basis of symptom development on the host.

Local symptom of White Rust

Local symptoms are seen on the particular area where the pathogen attacks on the crop plants. some of the localized symptoms are as:

  • white creamy pustules appears on the surface of the leaves, stem and inflorescence which are 1-2mm in diameter.
  • Pustules coalesce to form large irregular patches
  • Host epidermis rupture and exposed sori reveal a white powdery mass containing a number of spores.

Systemic symptom of White Rust

Systematic symptoms are those which occurs on different part of plants even if the pathogen attacks on certain region or part of the plants. it affects the physiology of the plant and shows symptoms like deformities and physiological disorder may be due to hormonal imbalance or other reasons. some of the systematic symptoms of white rust of crucifers are mentioned below:

  • When young stems and inflorescence are infected fungus become systemic and stimulates various types of deformities like hypertrophy and hyperplasia.
  • Due to deformities the flower axis and the flower stalks may be enormously thickened up to 12 to 15 times than the normal diameter.
  • Petals become sepal like and stamens leaf like or carpel like
  • Ovules or pollen grains usually atrophied .
  • Affected ovaries remain sterile.
  • If systemic infection occurs early, plant remains dwarf and only small leaves are formed
  • Axis of the inflorescence and stem are often twisted giving a zigzag appearance known as Staghead.

Disease cycle and epidemiology of white rust of crucifers

Oospore that survives in soil, seed, alternate and collateral host are the primary source of inoculum. Disease is carried from year to year through over wintering oospore. Secondary infection is carried by sporangia and zoospore.

RH more than 70%, 13-15ºc and 4-10 mm of water favors for stag head formation. In general 10-20ºc, RH 65%, moist, cool weather favors disease.

Management of White rust of Crucifers

  • First of all we must destroy plant debris, alternate and collateral host from our field.
  • Crop rotation should be followed integrating legumes.
  • Use of healthy seed is the must for healthy crop plant.
  • Use resistant varieties  Like radish, china rose winter
  • Seed treatment with systematic fungicide like captah, thiram or metalaxyl
  • Pre or co-inoculation with avirulent strain of candida provides protection against a virulent strain
  • Spraying Ridomil(0.1%), Metalaxyl(0.2%) at 20, 40,60 days after sowing helps to prevent White rust caused by Albugo candida.

Related Articles

धानबालीको फेद कुहिने रोग कसरी नियन्त्रण गर्ने?

धानबालीको फेद कुहिने रोग कसरी नियन्त्रण गर्ने ?  धानबालीमा लाग्ने रोगहरु मध्ये फेद कुहिने/बकाने एउटा प्रमुख रोग हो। जापानी भाषामा ‘बकाने’को अर्थ ‘मुर्ख बेर्ना’ हो।...

Zero Budget Natural Farming: Approach towards Sustainable Agriculture

Zero Budget Natural Farming: Approach towards Sustainable Agriculture Agriculture is one of the essential requirements to produce food. Assuming we take a gander at the...

बोधिचित्त: धार्मिक महत्व र खेती प्रविधि

बोधिचित्त: धार्मिक महत्व र खेती प्रविधि के हो बोधिचित्त ? नेपालको काभ्रेपलाञ्चोक जिल्लाको तिमाल क्षेत्रमा उत्पति भएको, झट्ट हेर्दा बयरकै एक प्रजाति भित्र पर्ने, स्थानीय वनस्पति...

LEAVE A REPLY

Please enter your comment!
Please enter your name here

Latest Articles

धानबालीको फेद कुहिने रोग कसरी नियन्त्रण गर्ने?

धानबालीको फेद कुहिने रोग कसरी नियन्त्रण गर्ने ?  धानबालीमा लाग्ने रोगहरु मध्ये फेद कुहिने/बकाने एउटा प्रमुख रोग हो। जापानी भाषामा ‘बकाने’को अर्थ ‘मुर्ख बेर्ना’ हो।...

Zero Budget Natural Farming: Approach towards Sustainable Agriculture

Zero Budget Natural Farming: Approach towards Sustainable Agriculture Agriculture is one of the essential requirements to produce food. Assuming we take a gander at the...

बोधिचित्त: धार्मिक महत्व र खेती प्रविधि

बोधिचित्त: धार्मिक महत्व र खेती प्रविधि के हो बोधिचित्त ? नेपालको काभ्रेपलाञ्चोक जिल्लाको तिमाल क्षेत्रमा उत्पति भएको, झट्ट हेर्दा बयरकै एक प्रजाति भित्र पर्ने, स्थानीय वनस्पति...

खरायो पालन : एक लाभदायक व्यवसाय

खरायो पालन : एक लाभदायक व्यवसाय  १. परिचय: उत्पतिस्थल पश्चिम युरोप र अफ्रिका मानिएको खरायो (Oryctolagus Cuniculus), आफ्नो दिशा आफै खाने (Capraphagic anima) स्तनधारी प्राणी हो...

Forest Soil and Its Uses

Forest Soil and Its Uses Forest soils are the soils found in the Hilly and Mountain areas where sufficient rain forests are available. They are...
en English
X