Strobilomyia laricicola (Karl, 1828)

on Larix

parasite

Oviposition, mostly a single egg, generally on a needle at the base of an then still very young cone. The emerging larve first consumes the seeds at the base of a cone scale, then starts a spirally trajectory af about three loops around the cone axis, eating all seeds it encounters. When almost fully fed it makes a tunnel in length of the axis, leaves the axis, eats a bit more, then leaves the cone and drops to the ground where a puparium is made in de litter under the tree. There is one generation. Not a word about galling of the cone.

hostplants

Pinaceae, monophagous

Larix decidua, gmelinii, kaempferi, sibirica.

distribution within Europe

(PESI, 2018).

synonyms

Lasiomma, Phorbia, laricicola.

larva

Strobilomyia laricicola: cephalic skeleton

cephalic skeleton of the 3rd instar larva (from Roques ao, 1984a)

notes

Mainly a species of altitudes above 1400 m. Considered a pest in forestry, but until 1965 often confused with other species of the genus.

references

DuĊĦek (1969a), Michselsen (1988b), Roques, Martinez & Deplanque (1983a), Roques, Raimbault & Deplanque (1984a).

mod 23.vi.2018