Panonychus ulmi, the European red mite, is a species of mite which is a major agricultural pest of fruit trees. It has a high reproductive rate, a short generation time (21 days at ) and produces many broods in a year, all of which contribute to its pest status. It has a cosmopolitan distribution, and a very wide host range, having been found on the following plants:
Panonychus ulmi was first described by Carl Ludwig Koch in 1836, under the name Tetranychus ulmi. It has also been known under a number of synonyms:
- Tetranychus ulmi <small>Koch, 1836</small>
- Oligonychus ulmi : <small>Hirst, 1920</small>
- Metatetranychus ulmi : <small>Oudemans, 1931</small>
- Paratetranychus ulmi : <small>André, 1937</small>
- Panonychus ulmi : <small>Ehara, 1956</small>
- Tetranychus pilosus <small>Canestrini & Fanzago, 1876</small>
- Paratetranychus pilosus : <small>Zacher, 1913</small>
- Metatetranychus pilosus : <small>Oudemans, 1931</small>
- Paratetranychus pilosus alboguttatus <small>Zacher, 1913</small>
- Tetranychus alboguttatus <small>Zacher, 1913</small>
- Metetetranychus alboguttatus : <small>Oudemans, 1931</small>
- Paratetranychus pilosus occidentalis <small>McGregor & Newcomer, 1928</small>
- Oligonychus alni <small>Oudemans, 1929</small>
- Metatetranychus alni : <small>Oudemans, 1931</small>
- Oligonychus muscorum <small>Oudemans, 1929</small>
- Metatetranychus muscorum : <small>Oudemans, 1931</small>
- Oligonychus potentillae <small>Oudemans, 1929</small>
- Metatetranychus potentillae : <small>Oudemans, 1931</small>
- Metatetranychus mali <small>Oudemans, 1931</small>
- Metatetranychus canestrinii <small>Oudemans, 1939</small>
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