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Shoot Borer (Chlumetia transversa)

 Image of Shoot Borer(Chlumatia transversa)

Shoot Borer (Chlumetia transversa) is a serious pest of mango (especially seedlings and young trees) that eats developing leaves and tunnels into the midrib and terminal shoots. This pest is found all over the country. Larvae of this moth bore into the young shoot resulting in dropping of leaves and wilting of shoots. Larvae also bore into the inflorescence stalk. The adult moths are shining grey in colour and measure about 17.5 mm with expanded wings. Hind wings are light in colour. Female moths lay eggs on tender leaves. After hatching, young larvae enter the midrib of leaves and then enter into young shoots through the growing points by tunnelling downwards. The full grown larva is dark pink in colour with dirty spots and measures about 22 mm in length. There are four overlapping generations of the pest in a year and it overwinters in pupal stage.

Control:

  • The attacked shoots may be clipped off and destroyed.
  • Spraying of Carbaryl (0.2%) or Quinalphos (0.05%) or Monocrotophos (0.04%) at fortnightly intervals from the commencement of new flush gives effective control of the pest.
  • A total of 2-3 sprays may be done depending on the intensity of infestation.