Scale Insects

Scale Insects: Melanaspis glomerata


  • The leaves of infested canes show signs of tip drying and unhealthy pale green colour and severe infestation causes yellowing.
  • Severe decapping leads to non-opening of leaves, which also turn yellow and finally dry up.
  • Infested crop losses its vigour, canes shrivel, growth is stunted and the internodal length is reduced drastically.
  • Ultimately cane dries up. Such canes when slit open appear brownish red.
  • Thick brown encrustations are seen on the nodal and internodal regions in severely affected canes.

Identification of pest:

  • Nymph: Females multiply ovo-viviparously. The nymphs that hatch out from the eggs within the female’s body come out through the genital aperture. They are called ‘crawlers’. They settle after selecting a suitable site for feeding.
  • Adult: Greyish black or brown circular scales, they cover the nodal region forming a thick encrustation.


Cultural method:

  • Use resistant varieties like CO 439, CO 443, CO 453, CO 671, CO 691 and CO 692
  • Select and plant the scale insect free setts.
  • Keep the fields and bunds free from weeds.
  • Avoid water stagnation in the field for a longer period.
  • Avoid repeated ratoons.

Physical method:

  • Detrash the crop at 150th and 210th day of planting.
  • Setts should be dipped in dichlorvos at 1ml per lit of water and placed in cement bags with the mouth tied and transported to planting area

Biological method:

  • Release Chilocorus nigritus (or) Pharascymnus horni egg card @ 5cc/ac
  • Also release hymenopteran parasitoides like anabrotepis mayurai, cheiloneurus sp and predatory mites like saniosulus nudus and tyrophagus puttseartiae which feed on scale insect.

Chemical method:

  • Pre-soak the setts in 0.1% solution malathion.
  • Spray dimethoate @ 2ml/ lit along with sticker after detrashing.
  • Apply contact insecticides like dichlorvos or any @ 2ml/lit of water by using hand sprayer.




  • TamilNadu Agritech Portal
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