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Crop Protection :: Pests of Guava

Guava fruit fly: Bactrocera diversus

Symptoms of damage

  • Adults and maggots attack semi – ripe fruits
  • Oviposition punctures on fruits
  • Maggots destroy and convert pulp into a bad smelling
  • Discoloured semi liquid mass

Identification of pest

  • Adult - Brown or dark brown with hyaline wings and yellow legs

Management

  • Collect and destroy fallen and infested fruits
  • Summer ploughing to expose pupa
  • Use methyl eugenol lure trap (25/ha) to monitor and kill adults of fruit flies
  • Prepare methyl eugenol and malathion 50 EC mixture at 1:1 ratio( take 10 ml mixture/ trap)
  • Inseciticides: malathion 50 EC 0.05%
  • Bait spray combining molasses or jaggery 10g/l and one of the insecticides,
    • malathion 50 EC 2 ml/l
    • dimethoate 30 EC 1ml/lit, two rounds at fortnight interval before ripening of fruits
    • Field release of parasitoids such as
      • Opius compensatus
      • Spalangia philippinensis,
      • parasitoid wasp, Diachasmimorpha kraussi
Diachasmimorpha kraussi

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