Adelges laricis Vallot, 1836

on Picea, primary host plant

Adelges laricis galls

Picea abies, France, Rhône-Alpes, Haute-Savoie, Saint-Gervais-les-Bains © Arnold Grosscurt

Adelges laricis gall

the pale colour of the gall is diagnostic

Adelges laricis opened gall

opened gall

Adelges laricis: very young gall with aphids on Picea abies

Picea abies, Germany, Bavaria, Schwangau; very young gall, with aphids (so called “strawberry gall”) © Arnold Grosscurt

gall

The gall has has a creamy colour, 1-1.5 cm diameter, a globular shape and a waxy texture.

host plants

Pinaceae, monophagous

Picea abies, alcoquiana, glauca, koraiensis, mariana, orientalis, pungens, sitchensis.


on Larix, secondary host plant

Adelges laricis: apterae on Larix decidua

Larix decidua, Heerde, lg de Dellen © Hans Jonkman

Adelges laricis: damage on Larix decidua

Larix decidua, Hongarije, Budapest © László Érsek

Adelges laricis: damage on Larix decidua

detail

Adelges laricis: fresh infestation

fresh infestation

Adelges laricis: aphid

aphid with eggs

Adelges laricis: female on Larix decidua

close-up

Adelges laricis on Larix decidua: alatoid larvae

two larvae in different stages, both recently moulted,
therefore without wax

Adelges laricis on Larix decidua: alatoid larva

larval alata (wing pad clearly visible)

gall

On the secondary host plant no gall formation takes place. In he autumn a larval female establishes itself on a shoot of the current year. In the following spring she is mature and produces a mass of eggs. The resulting aphids feed on the fresh needles and produce copious amounts of wax-wool and honeydew. The needles are discoloured, swollen and untidily curved in all directions. The aphids are dark green to black

hostplants

Pinaceae, monophagous

Larix decidua, x eurolepis, gmelinii, kaempferi, laricina, lyallii, sibirica.

synonyms

Adelges lariceti (Altum, 1889); A. strobilobius (Kaltenbach, 1843); A. coccineus (Ratzeburg, 1843).

notes

The species is closely related to, and very difficult to separate from, Adelges tardus (Dreyfus, 1888); that species does not migrate to Larix and the galls ripen later, in August-October, instead of June.

references

Albrecht (2017a), Barbagallo, Binazzi, Pennacchio & Pollini (2011a), Béguinot (2002e,g,h, 2007b), Bellido, Ros-Farré & Pujade-Villar (2003a), Börner & Franz (1956a), Buhr (1964b, 1965a), Chinery (2011a), Coulianos & Holmåsen (1991a), Dauphin & Aniotsbehere (1997a), Favret, Havill, Miller ao (2015a), Grosscurt (2017a), Hellrigl (2004a), Houard (1908a), Kollár (2007a, 2011a), Lambinon, Carbonnelle & Claerebout (2015a) Carter (1971a), Castresana & Notario (1992a), Covassi & Binazzi (1981a), Lambinon & Romain (2009a), Lambinon & Schneider (2004a), Lampel (1988a), Lampel & Meier (2003a), Lehmann & Hannover (2016a), Notario, Baragaño & Castresana (1992a), Osiadacz & Wojciechowski (2008a), Rakauskas & Trukšinaitė (2011a), Redfern & Shirley (2011a), Ripka, Reider & Szalay-Marzsó (1998a), Roskam (2009a), Sylvén (1960a), Tomasi (2003a, 2012a, 2014a).

mod 29.v.2018