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learning behavior in wasp - Hyssopus pallidus

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learning behavior in wasp - Hyssopus pallidus

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Hyssopus pallidus is Parasitoid Wasp feed on codling moth that is pest of apple fruit. in this topic learning behavior is discussed.
Contact Email: mzeeshan_93@yahoo.com

Hyssopus pallidus is Parasitoid Wasp feed on codling moth that is pest of apple fruit. in this topic learning behavior is discussed.
Contact Email: mzeeshan_93@yahoo.com

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learning behavior in wasp - Hyssopus pallidus

  1. 1. Muhammad Faisal Riaz 24 Nimra Altaf Faizan Iqbal Faiz ullah Faiz 04 Muhammad Zeeshan Nazar 01 Jafar Ali Naqi Khan
  2. 2. Learning in the Parasitoid Wasp (Hyssopus pallidus)
  3. 3. Before discuss this case study We should know, A parasitoid’s host-searching ability depends on, i. Responses to chemical cues. ii. These responses have both genetic and learned components.  Any critical phase at which a parasitoid is more likely to learned?  Does learning carry through from one life stage to another? Questions arise in this topic are
  4. 4.  Cydia pomonella is the major pest of apple fruits. Hatched parasitoid larvae disperse throughout the orchard to find new host.  Hyssopus pallidus (parasitoid) used as biocontrol.
  5. 5. Q. Either wasp depends on the traces of (Moth’s) frass in the channels of infested fruit or not??? Moth’s caterpillar feed on Artificial diet Strong decline of the response to frass of moths that fed on artificial diet while other group showed opposite result. Apple cues
  6. 6. • Host derived frass were recognized innately • But learning was required before wasp recognized fruit derived components. Q. Did parasitoid need to learn fruit related chemicals from caterpillars and their feces or exposure to fruit itself was sufficient? After perceiving the existence of learning behavior, the question arise
  7. 7. Moth Caterpillars (1st instar moth) Apple Feed Extract Worm Waited for 5th instar Worm Filter paper with extract Apple pieceApple Extract Feed on wheat germ Introduced mated female in each group New cage without apple cues New Generation
  8. 8. New Generation 4 days old Filter paper on top treating with apple extract Hyssopus larva fed with apple diet showed significantly greater response to host frass than reared without apple cues.
  9. 9. Q. Did a high response to host frass require exposure to both the taste and smell of apple? Apple supplement Odor of apple extract Both treatments enhanced female response but their response towards olfaction was more effective as taste and smell together. Parasitoids reared on caterpillars Parasitoids reared on caterpillars
  10. 10. Q. Was their a sensitive stage in parasitoid’s life history for learning the relevant stimuli? Wasps exposed to apple clues at different developmental stags. Never exposed to apple at all Group 1 Showed greater response as adult to natural frass. Exposed to apple throughout its life Group 1 Group 2
  11. 11. Stage exposed to odour of apple fruit extract Adult response to frass extract from apple-fed host caterpillars Total development Egg-young larva Old larva-pupa Pupa emergence Adult No Exposure (Control) (0) 0 5 10 15 20 20 40 60 80 100 120 140 160 180 Response(s)Days from oviposition
  12. 12. Parasitoids are more responsive to the control than menthol Control Group Parasitoid used only solvent Egg to Larvae Experimental Group Parasitoid used Menthol Q. Was pre-imaginal learning confined to fruit cues, or was it a more general phenomenon?
  13. 13. Parasitic wasp Hyssopus pallidus learns to locate its hidden host by its frass and this recognition is two stage process.  Host-derived chemicals in frass innately.  Apple derived chemicals learned only through exposure in early life cycle; not early adulthood, but from egg to larva

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