Cheilosia grossa (Fallén, 1817)

large spring cheilosia

on thistles

parasite

Usually about 4 eggs are deposited simultaneously near the tip of a young stem. The larvae enter the stem and descend as borers down to about the root collar. The larvae are able to emerge from the stem, crawl downwards, and re-enter the stem above a leaf base. Pupation in the soil. Partly because the eggs are deposited in batches the growing point generally is killed, which forces the plant to make a bush of several new stems.

host plants

Asteraceae-Carduinae, narrowly monophagous

Carduus crispus, nutans & subs leiophyllus + subsp. scabrisquamus, pycnocephalus, tenuiflorus; Cirsium eriophorum, palustre, vulgare.

distribution within Europe

(PESI, 2019).

larva

synonyms

Cheilosia grossa (Harris, 1780).

references

Reemer, Renema, van Steenis ao (2009a), Rizza, Campobasso, Dunn & Stazi (1988a), Rotheray (1988b), Sheppard, Aeschlimann, Sagliocco & Vitou (1995a), Speight (2017a).

mod 16.vi.2019