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Spill-over attack by the gall fly, Urophora stylata, on congeners of its target weed, Cirsium vulgare
(New Zealand Plant Protection Society (Inc.), 2020-01-27)
The gall fly, Urophora stylata, was released in New Zealand in 1998 as a biocontrol agent against the thistle weed, Cirsium vulgare (Scotch thistle). In the summer of 2018, a survey was conducted to assess the field host ...