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Csl Pest risk analysis for Neotoxoptera Formosana


Neotoxoptera formosana is an aphid pest of a number of commercial horticultural crops. It has a narrow host range and it represents a potential risk to the UK Allium industry. It can transmit viruses that cause plant damage and stunting although it is not a very efficient vector. There are no reports of serious damage in the literature although enormous populations can build up on Allium in storage. 

There is evidence that it is capable of being carried in trade internationally, although this is not common. It is able to survive in the UK climate. It can also survive in protected cultivation. As a parthenogenic species, an individual female can initiate population growth. Despite its presence in the USA and Australia, there is little information in the literature, suggesting it is a minor pest, or a pest that is already well managed in these places. Within Europe the organism can become a local pest as noted in Italy, and in Germany for the first time in 2007, although it is not reported as a pest in France despite it having been present since 1984.

 Since this organism is present in France, Italy, Germany and the Netherlands and is not causing a major problem there is little likelihood that it will become an EU listed quarantine pest, nevertheless eradication of isolated outbreaks detected in the UK could be worthwhile.


  • Neotoxoptera formosana


  • Allium cepa
  • Allium porrum
  • Allium sativum
  • Allium schoenoprasum


Type File Size
Pest Risk Analysis Download 62,27kB

PRA Area

  • United Kingdom