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Dernière mise à jour : Mai 2018

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Encyclop'APHID

Antagonists

As Jules Renard observed, "It is not because there is a rose on the rose bush that a bird sets foot there: it is because there are aphids” :

Role of natural enemies

Other than the effects exerted by abiotic factors (wind, rain, heat, cold and so on), natural antagonists limiting aphid populations are essentially insects. The arachnids probably also play an important role. Birds too play their part, among which partridges and blue tits can be significant predators. In the realm of fungi, some can induce full-blown epizootics in aphid colonies.

Following classical definitions, the following types of entomophagous organisms can be distinguished:

  • predators need several kinds of prey for them to accomplish their cycle,
  • parasitoids generally develop on just one host, often inside it, and which they kill once their larval development is complete
  • hyperparasitoids develop at the expense of primary parasites present in the aphids
  • pathogens disease-generating micro-organisms (fungi, bacteria, viruses and so on).
Coccinella septempunctata : adulte
Aphelinus abdominalis et Sitobion avenae
Asaphes pondant dans une momie de Microlophium carnosum
Erynia neoaphidis sur Sitobion avenae

 Coccinella septempunctata

 Aphelinus abdominalis

 Asaphes sp

 Erynia neoaphidis