native to, and widespread across, the Palaearctic(2); adventive in NA and now transcontinental in Canada & n. US (NS-BC to NC-IL-UT-OR)(1), Chile, Australia (Malipatel et al. 1995)
hosts: mostly Polygonaceae (esp. Polygonum, Rumex), also Chenopodium, etc.(2)(3)
fully grown larvae move from host to form pupal cell in substrata such as apples, various stalks, twigs & canes, rotten wood, etc. (and thus may be reared from unrelated plants); 3 generations a year(1)
introduced in NA probably from Europe before 1860 (Dr Smith, pers. comm.)
may damage other plants (such as raspberry) in areas where primary hosts are abundant (Malipatel et al. 1995)
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