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Parasitic Wasp

Parasitic Wasp

A parasitic wasp is a type of insect that parasitizes other insects, often those that are pests, by laying its eggs on or inside their bodies. The larvae of the wasp feed on the host insect, eventually killing it. This makes parasitic wasps valuable in controlling populations of harmful insects, as they can help reduce the need for chemical pesticides.

Parasitic wasps play an important role in many ecosystems, serving as natural predators of harmful insects and helping to maintain the balance of nature. They are also of great interest to scientists, who study their biology and behaviour to better understand their role in ecosystems and how they can be used in pest control.


  • Parasitic wasps are small insects that vary in size and shape depending on the species.
  • They have a distinct appearance, characterized by their long and slender bodies, delicate wings, and unique colour patterns.
  • Most parasitic wasps have a narrow waist, which separates the thorax from the abdomen.
  • Their thorax is usually small and compact, with a pair of slender legs attached to each segment.
  • Their wings are transparent, and some species have brightly coloured markings that serve as camouflage or warning signals.
  • The colour of parasitic wasps ranges from metallic greens, golds, and blues to black and brown.
  • Some species have intricate patterns of stripes, spots, or dots on their bodies.
  • The abdomen of these insects is often segmented and can be black, brown, or striped with yellow or red.

Parasitic Wasp

Life Cycle

  • The life cycle of a parasitic wasp can be divided into four main stages:
  • Egg: A female wasp lays her eggs inside the host insect (such as a caterpillar or aphid).
  • Larva: The wasp eggs hatch into larvae, which feed on the host insect. They grow and molt several times as they continue to consume the host, eventually killing it.
  • Pupa: The larvae then form pupae, encased in a cocoon, where they undergo metamorphosis into adult wasps.
  • Adult: Once the metamorphosis is complete, the adult wasps emerge from their cocoons and mate. Female wasps then seek out new hosts to lay their eggs in, starting the life cycle all over again.


  • They use various sensory cues such as visual, chemical, and behavioural signals to select the appropriate host.
  • Female parasitic wasps lay their eggs on or inside the host. They often insert their eggs into the host’s body using their ovipositor.
  • The wasp larva feeds on the host’s tissues, slowly killing it.
  • After feeding on the host’s tissues, the wasp larva pupates and emerges as an adult.
  • Adult parasitic wasps mate and reproduce, continuing the cycle of parasitism.
  • Parasitic wasps feed on nectar, pollen, and other insects.
  • Some species of parasitic wasps are migratory, travelling long distances to find new hosts and areas to lay their eggs.