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Pests of Sweet Potato – Kisan Suvidha
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Pests of Sweet Potato

sweet potato pests

Pests of Sweet Potato

Major Pests of Sweet Potato are:-

1.Sweet potato weevil: Cylas formicarius

sweet potato weevil

Symptoms of damage:

  • Thickening and malformation of vines and often cracking of the tissue.
  • Discoloration, cracking or wilting of damaged wines
  • An infested tuber is often riddled with cavities or tunnels
  • Attacked tubers become spongy, brownish to blackish in appearance
  • Start rotting form the top and develop an unpleasant smell and a bitter taste
  • Unfit for human consumption.

Identification of pest:

  • Egg: Oval, yellowish-white laid singly in small cavities on the sweet potato root or base of the vine. The cavity is then sealed with a plug of the mother’s excrement
  • Larva: Legless grub, white in colour. Head is comparatively large and brown or pale yellow
  • Pupa: Pupa is whitish in colour and pupation takes place in the feeding tunnel
  • Adult: Weevils are beetles with a long pointed snout, body is slender resembling ants

Management:

  • Crop rotation with rice between two sweet potato
  • Use insect-free vines as planting material
  • Harvest the crop immediately after maturity
  • Avoid or minimize cracks in the soil
  • Flooding of infested fields for at least 48 hours after completing harvest drowns weevils induces rotting of the leftover plant materials and thereby reduces weevil densities
  • Remove alternate host, Ipomea sp and destroy them.
  • Mulch with leaves of Eupatorium @3 tonnes/ha at 30 DAP
  • Use cut sweet potato tubers (100g) as trap during 50-80 DAP at 10 days interval
  • Set the trap at 5 m apart at 4 PM, collect and destroy adult weevils at 6 AM next day
  • Rake up the soil and earth up at 50 days after planting

 

2.Tortoise beetles: Aspidiomorpha miliaris,Cassida circumdata

sweet potato tortoise beetles

Symptoms of damage:

  • Young grub scrape on the upper surface of the leaves
  • Older grub and adults bite large round holes in the leaves

Identification of pest:

  • Grub: Oval, flattened yellowish with spiny processes covering the body.
  • Pupa: Is less spiny than the larva, and is fixed to the leaf
  • Adult:
    • Aspidiomorpha miliaris: Broad oval shaped brownish red in colour With black dots
    • Cassida circumdata: Broad oval shaped, greenish yellow in colour with green crescent mark in middle
    • Chirida bipunctata: Small metallic green in colour with six black spots on elytra

Management:

  • Collect and kill the grubs
  • Spray Malathion @ 200 ml/ac
  • Use insect-free vines as planting material
  • Use yellow sticky trap @12/ha
  • Spray Carbryl @1.25 kg/ha at 21 days interval at the time of harvesting sweet potato.

 

Source-

  • TamliNadu Agritech Portal

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