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Crop Protection :: Pests of Black and Green Gram
Spotted pod borer: Maruca testulalis

Symptoms of damage 

  • Webbing together of flowers, pods and leaves with silken threads
  • Damaged pods - darkened entry holes on the pods.
  • First instar larvae prefer flowers and the third and fourth instar bore in to the pods
  • Through the entry holes, water will enter into the pods causing rotting and browning of   seeds.

Identification of the pest

    Eggs:
  • 400 scaly eggs singly or in clusters of 2 - 16 in the sepals, petals of the flower or buds or on pods.
  • * Egg period 2 – 3 days
    Larva:
    Young ones - dull white
    * Grownup larvae - black-headed, with irregularly shaped brown or black spots on the dorsal, lateral and ventral surfaces of each body segment.
    * Larval period - 8 to 14 days
    Pupa:
  • In double-walled pupal cell under the leaf debris or soil.
  • * Pupal period - 5 to 15 days.
  • Moth:
  • Light brown forewings with white markings and white transparent hind wings with brown irregular markings at the lateral edge.
  • Life span - 7 to 10 days.
  • At rest, the wings are rested always an angle to the surface.
Economic threshold level - 3 larvae / plant
DSCN5126 4
                      Webbings                                                  Larva


DSCN5126 4
                  Larva inside pod                                            Adult

Integrated Management:

  • The weed hosts such as Sesbania spp. has to be removed from the cropping area.
  • Growing of sunnhemp as a trap crop. The plant is highly attractive to egg laying female moth but unsuitable for development of larvae.
  • The avoidance of broad-spectrum insecticides before flowering encourages the natural enemies population
  • Azadirachtin 0.03% WSP (300 PPM) @ 1000 ml/ac
  • Bacillus thuringiensis var. kurstaki @ 200 – 250 ml/ac
  • mamectin benzoate 5 SG @ 80 – 90 g/ac
  • Indoxacarb 15.8 SC @ 133 ml/ac
  • Chlorantraniliprole 18.5 SC @ 40 ml/acre
  • Spinosad 45SC @ 50 – 64 ml/ac
  • Flubendiamide 480 SC @ 40 ml/acre


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