Adelges (Adelges) laricis Vallot, 1836

Albrecht, Anders Christian, 2017, Illustrated identification guide to the Nordic aphids feeding on Conifers (Pinophyta) (Insecta, Hemiptera, Sternorhyncha, Aphidomorpha), European Journal of Taxonomy 338, pp. 1-160 : 24

Adelges (Adelges) laricis Vallot, 1836

Figs 58–61

Diagnosis

Neosistens: About 0.3 mm, brownish black, without wax secretion. Dorsal plates of head and thorax fused. Dorsum heavily sclerotised and somewhat wrinkled. Adult aptera oval or sub-circular, blackish or dark grey, about 1 mm., usually with wax wool. Alata 1.0– 1.5 mm, head with anterior and posterior wax gland areas, if present, usually separate. Al. gallicola (migrating from Picea ) with poorly developed wax secretion. Holocyclic and dioecious, alternating between Picea (p. 9) and Larix . On Larix overwintering at bud bases or in bark crevices on twigs and branches. In spring and summer on needles. Not antattended.

Recorded secondary hosts

Pinaceae : Larix decidua *, decidua x kaempferi , gmelinii , kaempferi *, laricina *, lyallii *, sibirica *, spp.

Distribution

D F N S.

Figures

Fig. 58. Adelges (Adelges) laricis Vallot, 1836. Neosistentes in winter on twigs of Larix sibirica.

Fig. 59. Adelges (Adelges) laricis Vallot, 1836. Apterous and alate progredientes on Larix sibirica.

Fig. 60. Adelges (Adelges) laricis Vallot, 1836. Adult apterous progredientes with eggs and honeydew droplets on Larix sibirica. (A–D) and Larix kaempferi (E–F). Scale bars: about 2.5 mm.

Fig. 61. Adelges (Adelges) laricis Vallot, 1836. A. Sexupara (after Carter 1971, redrawn from Heie 2004). B. Adult apterous progrediens (after Börner 1908, redrawn from Heie 2004). C. Antenna of gallicola (after Annand 1928, modified). D. Neosistens (after Schneider-Orelli 1947, modified).