Therioaphis trifolii

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Therioaphis trifolii apterous vivipara (click on image to enlarge it)
Author(s): Simon Hinkley & Ken Walker, Museum Victoria
Source: PaDIL

Therioaphis trifolii (Monell, 1882) - (spotted alfalfa aphid)

The aphid is native in Europe and the Mediterranean region and has spread to other regions like North America (1950's) and Australia (1977), as well as to South Africa, Japan and New Zealand (all around 1980). In the invaded countries, it has become a serious pest of alfalfa, causing extensive damage. In Australia, control was achieved through resistant varieties and the introduction of a parasitic wasp from Iran. However, new outbreaks were recorded there since 1989 by a genetically distinct biotype, known as the spotted clover aphid.

Vernacular names
• Deutsch: Luzerneblattlaus
• English: spotted alfalfa aphid
spotted clover aphid
yellow clover aphid
• Français: puceron de la luzerne

The aphid is about 1½ mm long and yellowish–green, with four to six rows of dark spots running along the length of its back. It causes veinal chlorosis and sooty mold due to honeydue excretion. It can transmit viruses like the Alfalfa mosaic virus or Cucumber mosaic virus.

Synonyms:
Therioaphis maculata
Therioaphis trifolii forma maculata