Summer Insects- Pests and Diseases in Okra.

Summer Insects- Pests and Diseases in Okra.


  1. Root-knot nematode in Okra (Meloidogyne incognita)

The knots can be seen on the roots of infected plants. The leaves turn pale and the growth of plants is restricted. The symptoms appear in patches. Fruiting is reduced.

Control.

  1. Deep ploughing of the field during summer to expose the soil to the sun.
  2. Follow crop rotation with rice, wheat, oat in nematode infected soil.
  3. Apply neem cake @ 20-25g/ha in soil


2. Jassid in Okra(Amrasca biguttual biguttula)

The nymphs and adults suck the cell sap from the lower surface of leaves. The affected leaves become pale and curl upward.

Control

Spray the crop Imidacloprid 17.8 SL or Thiomethoxum 70 WS @ 0.5-0.6ml/ liter water starting from the attack of insects.

3. Spider Mite in Okra(Tetranychus cinnabarinus)

The insect sucks the sap from tender parts of the plant. The affected leaves turn pale and finally, defoliation occurs.

Control - Spray the crop with Propogite @ 2-3 ml/liter water.

4. White fly in Okra(Bemisia tabaci)

The insects do not cause considerable damage to the crop but act as a vector to transmit the yellow vein mosaic virus disease.

Control.

  1. Threat seed with Imidacloprid or Thiomethoxam @ 3 g/kg seed.
  2. Spray the crop with Imidacloprid 17.8 SL or Thiomethpxam 70 WS @ 0.5- 0.6 ml/litre water.

5. Spotted Bollworm in Okra

The Larvae bore into the growing shoot initially and fruits at a later stage. The affected fruits spoil and become unfit for human consumption.

Spotted Bollworm in Okra

Control

  1. Follow crop rotation excluding cotton and hollyhock.
  2. Eradicate the host plants like cotton and hollyhock.
  3. Regularly remove the attacked fruits and bury them deep in the soil.
  4. Spray Spinosad 45 SC@ 0.5- 0.7  ml/liter water at fortnightly interval.


Fungal Disease

6. Damping off in Okra (Paythium sp., Rhizocotonia sp., Fusarium sp.).

Both pre and post-emergence of seedling occur. Affected seedlings rot at the collar region and topple down on the ground and finally die.

Control

  1. Provide proper drainage.
  2. Treat the seeds with Captain or Thirsm @ 3 g/kg seed before sowing.

7. Powdery Mildew in Okra.

 Powdery Mildew in Okra


White Floury growth of fungus appears on both the surface of leaves.

Control.

  1. Dust Sulphur @ 25 kg/ha.
  2. Spray Karathane (0.2%) at 15 days interval.

8. Fusarium Wilt in Okra (F. Oxysporum , F. Vasinfectum).

The disease is characterized by the yellowing of leaves followed by wilting and rolling. The affected plants remain stunted. Dark streaks can be seen in the vascular bundles of stem and root. The incidence is high in the rainy season crop.

Control.

  1. Adopt crop rotation.
  2. Give deep summer ploughing during summer to expose the soil to sun.
  3. Seed treatment with Thiram or Captan @ 3 g/kg seed.

9. Leaf Blight in Okra(Cercospora abemoschi)

Small brown to sooty black, angular spots appear on both the surface of leaves. The infection may result in premature defoliation. The older spots may coalesce. High atmospheric humidity is Favourable.

Control

Spray the crop with Bordeaux mixture (0.1%) or Bavistin (0.2%) or Dithane M-45 (0.2%) at 15 days intervals.

Viral Diseases

10. Yellow Vein Mosaic Virus in Okra

It is caused by Begomovirus. The disease is characterized by the yellowing of veins. In extreme cases the entire leaf turns completely yellow colored. The infected plants remain stunted and bear very few yellow colored fruits. The virus is transmitted by whitefly (Bemisia tabaci).

Yellow Vein Mosaic Virus in Okra

Control

  1. Grow resistant varieties like Prabhani Kranti, Varsha Upar, Punjab Padmini, Arka Abhay, Arka Anamika.
  2. Rogue out the diseased plants from the field as earliest as possible.
  3. Control white fly by spraying Imidacloprid 17.8 SL(0.5-0.6 ml/litre water) at an interval of 10 days.

11. Enation Leaf Curl in Okra.

Small, pinhead outgrowth (enations) on the undersurface of leaves appear and leaves curl in an adaxial direction. The most characteristic symptoms of the disease are twisting and bending of leaf petioles. The virus is also transmitted by whitefly.

Control.

  1. Roughout the diseased plants and burn them.
  2. Spray the crop with Imidacloprid 17.8 SL @ 0.5 - 0.6 ml/ litre water to control white fly.

Integrated Disease Management(IDM).

  1. Summer ploughing for desiccation of nematode larvae and soil pathogen.
  2. Crop rotation with cereals and low land paddy.
  3. Seed treatment with Bavistin @ 0.3 per cent.
  4. Okra sowing should be completed by the first week of July.
  5. Use resistant varieties like Pusa A-4, Kashi Vibhuti and Kashi Pragati.

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