Papaya (Carica papaya)

Aphids (Aphis gossypii)

Symptoms

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  • The pest attacks young stems and the undersides of leaves.
  • Leaves curl.
  • Plant stunts.
  • Fungal growth is seen on the leaves due to the honey-like fluid secreted by the pest.

Management

  • Check transplants for aphids before planting.
  • Reflective mulches such as silver colored plastic can deter aphids from feeding on plants.
  • Sturdy plants can be sprayed with a strong jet of water to knock aphids from leaves.
  • Use yellow sticky traps for aphids and whitefly @ 4-5 trap/acre.
  • Release 1st instar larvae of green lacewing bug (Chrysoperla zastrowi) @ 4,000 larvae/acre.
  • Spraying with tobacco decoction (1 Kg tobacco boiled in 10 l of water for 30 minutes and making up to 30 l + 100 g soap).
  • Organic control includes insecticidal soaps (1%) and horticultural mineral oils (1%).
  • Spray with 4g thiamethoxam/10l of water
  • The entire plant canopy should be drenched with the solution
  • Natural enemies of aphid
    • Parasitoids: Aphidius colemani, Aphelinus sp.,
    • Predators: Fire ant, Robber flies, Big-eyed bug (Geocoris sp), Earwig, ground beetle, Cecidomyiid fly, Dragon fly, Praying mantis, Lacewing, Ladybird beetle, Spider etc.