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Horticultural crops :: Vegetables:: Bhendi

  1. Cercospora Leaf Spots:Cercospora malayensis, C. abelmoschi
  2. Fusarium wiltFusarium oxysporum f.sp. vasinfectum
  3. Powdery mildewErysiphe cichoracearum
  4. Vein-Clearing/Yellow Vein Mosaic

1. Cercospora Leaf Spots:Cercospora malayensis, C. abelmoschi

Symptoms     

  • In India, two species of Cercospora produce leaf spots in bhendi.
  • C. Malayensis causes brown, irregular spots and C.abelmoschi causes sooty black, angular spots.
  • Both the leaf spots cause severe defoliation and are common during humid seasons.

Management

  • Spraying Mancozeb 0.25 % control the disease.

2. Fusarium wiltFusarium oxysporum f.sp. vasinfectum

Symptoms

  • The conspicuous symptom is a typical wilt, beginning with a yellowing and stunting of the plant, followed by wilting and rolling of the leaves as if the roots were unable to supply sufficient water.
  • Finally, the plant dies.
  • If a diseased stem is split lengthwise, the vascular bundles appear as dark streaks.
  • When severely infected, nearly the whole stem is blackend.

Management

  • Treat the seeds with Mancozeb @ 3g/kg seed.
  •  Drench the field with Copper oxy chloride @ 0.25%.

3.Powdery mildewErysiphecichoracearum

Symptoms

  • Powdery mildew is very severe on bhendi.
  • Greyish powdery growth occurs on the under as well as on the upper surface of the leaf causing severe reduction in fruit yield.

Management

  • Spary inorganic sulphur 0.25% or Dinocap 0.1% 3 or 4 times at 15 days interval.

4. Vein-Clearing/Yellow Vein Mosaic :Bhendi yellow vein mosaic virus

Symptoms

  • Yellowing of the entire network of veins in the leaf blade is the characteristic symptom.
  • In severe infections the younger leaves turn yellow, become reduced in size and the plant is highly stunted.
  • The veins of the leaves will be cleared by the virus and intervenal area becomes completely yellow or white.
  • In a field, most of the plants may be diseased and the infection may start at any stage of plant growth.
  • Infection restricts flowering and fruits, if formed, may be smaller and harder.
  • The affected plants produce fruits with yellow or white colour and they are not fit for marketing.
  • The virus is spread by whitefly.
   

Management

  • By selecting varieties resistant to yellow vein mosaic like Parbhani Kranti, Arka Abhay, Arka Anamika, and Varsha Uphar, the incidence of the disease can be minimised.
  • The virus is transmitted by the whitely (Bemisia tabaci,.
  • Parbhani Kranti, Janardhan, Haritha, Arka Anamika and Arka Abhay can tolerate yellow vein mosaic.
  • For sowing during the summer season, when the whitefly activity is high, the susceptible varieties should be avoided.
  • Spraying monocrotophos 1.5 ml/litre of water can restrict the disease spread.
  • Synthetic pyrethroids should not be used because it will aggravate the situation.
  • It can be controlled by application of Chlorpyriphos 2.5 ml + neem oil 2 ml lit of water.

 


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