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Related Experiment Videos

Implications of predator foraging on aphid pathogen dynamics

H E Roy1, J K Pell, S J Clark

  • 1Department of Entomology and Nematology, Department of Statistics, IACR-Rothamsted, Harpenden, Hertfordshire, United Kingdom.

Journal of Invertebrate Pathology
|May 8, 1998
PubMed
Summary

Ladybird beetles (Coccinella septempunctata) foraging on fungus-infected aphids (Erynia neoaphidis) reduced pathogen density but increased fungal transmission to healthy aphids. Other predators showed varied interactions with infected prey.

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Area of Science:

  • Entomology
  • Pest Management
  • Biological Control

Background:

  • Ladybird beetles (Coccinella septempunctata) are important predators of aphids.
  • Aphids can be infected by entomopathogenic fungi like Erynia neoaphidis.
  • Understanding predator-prey interactions is crucial for biological control strategies.

Purpose of the Study:

  • To examine the foraging behavior of Coccinella septempunctata larvae on aphids infected with Erynia neoaphidis.
  • To assess the impact of ladybird feeding on fungal sporulation and transmission.
  • To evaluate the intraguild predation potential of other natural enemies on infected aphids.

Main Methods:

  • Larval foraging behavior (search time, feeding duration) was observed on infected and uninfected Acyrthosiphon pisum aphids.

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  • Fungal sporulation and conidial production were quantified after mechanical damage or feeding by ladybirds.
  • Transmission rates of Erynia neoaphidis to healthy aphids were measured in the presence of ladybirds and damaged cadavers.
  • Interactions of other predators (Pterostichus madidus, Chrysoperla carnea, Episyrphus balteatus) with infected aphids were assessed.

    • Main Results:

    • Coccinella septempunctata larvae searched longer and fed less on infected aphids compared to uninfected ones.
    • Ladybird feeding reduced fungal pathogen density but did not prevent transmission from damaged cadavers.
    • Adult ladybirds significantly increased fungal transmission to healthy aphids.
    • Other predators like Pterostichus madidus consumed infected aphids, while lacewing and hoverfly larvae did not.

    Conclusions:

    • Coccinella septempunctata larvae act as intraguild predators, impacting Erynia neoaphidis populations.
    • Ladybird foraging can reduce pathogen load but may inadvertently increase fungal spread.
    • Interactions with other natural enemies vary, highlighting complex intraguild dynamics in aphid biocontrol.