Since 1980, it has reached pine plantations in Uruguay, and later also Argentina, Brazil and Chile; it was found in South Africa in 1994.The population increased in the Great Lakes area from 2004 on; the species had reached Vermont, New York, Pennsylvania, Ohio, and Michigan by 2009.The Sirex woodwasp has a sturdy, cylindrical body without a waist, but with a pointed abdomen.The female body is 15–36 mm (0.59–1.42 in), and the male is 9–32 mm (0.35–1.26 in) long.
The native habitat of the Sirex woodwasp is the temperate Palaearctic, ranging from Maghreb over Europe, Siberia, and Mongolia, to the Kamchatka peninsula. The species has reached other continents, such as Australia, South Africa and North America, through the export of timber and firewood.
While invasion was prevented in North America for a long time, the Sirex woodwasp established itself in New Zealand around 1900.
There, it contributed to massive pine declines in the first half of the 20th century, spreading to Tasmania in the 1950s and then to the Australian mainland.
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This woodwasp is an invasive species in many parts of the world, including Australia, New Zealand, North America, South America, and South Africa, where it has become a significant economic pest of pine trees.