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24, chemin de Borde Rouge -Auzeville - CS52627 31326 Castanet Tolosan cedex - France

Last update: May 2021

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Encyclop'Aphid : l'encyclopédie des pucerons



This family brings together straw cereals (wheat, barley, oats, rye, and triticale), the forage grasses (Dactylis, cocksfoot grasses, Festuca (fescue), Timothy grass, English ray-grass and Italian ray-grass) and maize.

From the economics point of view the cereals make up the great majority of the production seeing that they cover over 9 million hectares and are grown on one out of two of all farms. Their role in crop rotation is especially significant in that these farms are very large-scale operations.   

Three species of aphids regularly occur on wheat, barley and maize:

  • Rhopalosiphum padi is particularly abundant on maize at the end of summer and beginning of autumn, and on early-sown winter cereals (beginning of October)
  • Metopolophium dirhodum and Sitobion avenae in their active stage mainly in spring, on barley but especially on wheat

See Aphid damage on Poaceae


In the Aphid key folder you will find simplified keys based on photos or morphological criteria to help with identification of species.

These aphids are followed by a whole procession of parasitoids, which in turn are divided into frequent and occasional species. In the Parasitoid key folder you will find a simplified key based on morpohological criteria  (wing venation) backed with photos.

Frequent parasitoids

Occasional parasitoids 

Aphidius avenae
Aphidius ervi
Aphidius rhopalosiphi
Aphidius uzbekistanicus
Ephedrus plagiator
Praon volucre

Adialytus ambigus
Aphidius colemani
Aphidius matricariae
Binodoxys angelicae
Diaeretiella rapae
Lysiphlebus fabarum
Lysiphlebus testaceipes

Monoctonus caricis
Monoctonus cerasi
Praon gallicum
Praon abjectum
Praon necans
Trioxys auctus


In a similar way the parasitoids are followed by a procession of hyperparasitoids as listed here. In the Hyperparasitoid key folder a simplified key is presented based on morphological criteria and backed with photos.










Asaphes sp.


Pachyneuron sp.
Coruna sp.



Syrphophagus sp.



Tetrastichus sp.



Dendrocerus sp.




Alloxysta sp.
Phaenoglyphis sp.