Plant Parasites of Europe

leafminers, galls and fungi

Pachycerus segnis

Pachycerus segnis (Germar, 1824)

on Boraginaceae

gall

weevil larvae in an egg-shaped earthen cell, up to 3 cm long, at the root collar; probably they pupate in the soil.

host plants

Boraginaceae, oligophagous

Anchusa azurea; Cynoglossum cheirifolium, creticum; Echium vulgare; Heliotropium europaeum.

synonyms

Pachycerus scabrosus Brullé, 1832; P. cordiger (Germar, 1819) nec Fuessly, 1775; P. madidus Schoenherr, 1823 nec (Olivier, 1807); Buhr inadvertently cited the species as P. madidus (Olivier).

notes

Huber & Vayssieres describe a completely different biology. The larve, strictly associated with the perennial Heliotropium europaeum lives at the roots, immobilized, in a cell made out of soil and secretion. In this cell also the pupation and hibernation takes place. The adults appear only ofter the winter rains has caused the disintegration of the cells. They suppose that this is the “true” cordiger, while scabrosus/madidus/segnis causes galls in Echium and other Boraginaceae..

references

Brun, Sheppard & Carrara (1993a), Buhr (1964a), Dauphin & Aniotsbehere (1997a), Dieckmann (1983a), Houard (1909a), Huber & Vayssieres (1990a), Mifsud & Colonnelli (2010a), Rheinheimer & Hassler (2010a), Stejskal & Trnka (2013a), Wapshere & Cullen (1984a).

Last modified 4.iii.2021