Nematus (genus)
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Nematus oligospilus (click on image to enlarge it)
Author: John La Salle, CSIRO
Source: Wikimedia Commons
Author: John La Salle, CSIRO
Source: Wikimedia Commons
Nematus Panzer 1801 - (willow sawflies)
This genus of sawflies is widely distributed in temperate regions of the northern hemisphere and includes more than 100 species. They are mainly monophagous or oligophagous and are specialised on different deciduous trees like willow, poplar or alder. A number are confined to willow species, are gregarious and can defoliate trees.
Several species have been also introduced into countries outside their native range and have become invasive. For example, the common willow sawfly, Nematus oligospilus, is native to Europe, Asia and North America. It has been introduced into South America, Australia, New Zealand and southern Africa.
Currently, the following species have been entered into the system:
