Dreyfusia merkeri Eichhorn, 1957

on Picea, primaire waardplant

Dreyfusia merkeri: gall on Picea orientalis

Picea orientalis, gall (from Binazzi & Covassi, 1991a)

gall

gall resembles the one of D. nordmannianae, but is somewhat larger (7-22 mm) and open in June, July.

hostplants

Pinaceae, (narrowly?) monophagous

Picea orientalis.

on Abies, secondary waardlant

gall

Larvae on the stem and heavy branches. Swelling and stunting of the branches by feeding damage. Not attended by ants. No macroscopic differences with nordmannianae and prelli.

hostplants

Pinaceae, monophagous

Abies alba, ?
nordmanniana.

synonyms

Adelges merkeri.

references

Albrecht (2017a), Barbagallo, Binazzi, Pennacchio & Pollini (2011a), Blackman & Eastop (2014), Buhr (1964a, 1965a), Binazzi & Covassi (1991a), Hellrigl (2004a), Redfern & Shirley (2011a), Roskam (2019a).