Diamond back moth

Diamond back moth: Plutella xylostella

Symptoms of damage:

  • Young caterpillars cause small yellow mines on leaves
  • Scrapping of epidermal leaf tissues producing typical whitish patches on leaves
  • Full-grown larvae bite holes in the leaves and feeds on curd.

Identification of pest:

  • Egg: Minute yellow coloured eggs laid singly or in groups on the upper surface of leaves
  • Larva: Pale yellowish green caterpillar
  • Pupa: Pupation takes place on the foliage in a transparent cocoon
  • Adult: Small greyish brown moth. Forewings have three white triangular spots along the inner margin. Adult folds the wings that appear with triangular markings, opposite wing with a diamond shape.


  • Remove and destroy all debris and stubbles after harvest of crop
  • Grow mustard as trap crop at 2:1 ratio (cabbage: mustard) to attract DBM for oviposition at least 10 days ahead of   planting of the main crop
  • Spray mustard crop with dichlorvos 76 WSC 0.076% to avoid dispersal of the larvae
  • Pheromone traps @12/ha
  • Crop rotation with cucurbits, beans, peas, tomato and melon
  • Larval parasitoid: Diadegma semiclausm @1,00000/ha (Hills–below 25–27ºC) Cotesia plutellae (plains) at 20000/ha release from 20 days after planting
  • Bacillus thuringiensis var kurstaki 2g/lit
  • Neem seed kernel extract 5%
  • Cartap hydrochloride 0.5% at 10,20 and 30 DAS (nursery) and primordial stage
Insecticide Dose
Azadirachtin 5% Neem Extract Concentrate 5.0 ml/10 lit.
Lufenuron 5.4 % EC 1.2 ml/lit.
Spinosad 2.5 % SC 1.2 ml/lit.
Trichlorofon 50 % EC 1.0 ml/lit.



  • TamilNadu Agritech Portal
Show Buttons
Hide Buttons