Gilletteella coweni (Gillette, 1907)
on Pseudotsuga
parasite
This species is closely related with G. cooleyi. The main difference is that while cooleyi in principle passes through a host alternation, coweni does not alternate.
hostplants
Pinaceae, monophagous
Pseudotsuga menziesii.
distribution within Europe
synonyms
Adelges coweni.
notes
Originally a species from California; introduced in Italy, and a serious pest there.
references
Barbagallo, Binazzi, Pennacchio & Pollini (2011a), Barbagallo & Pollini (2014a), Blackman & Eastop (2018), Carter (1971a), Covassi & Binazzi (1981a), Hellrigl (2004a), Roversi & Binazzi (1996a).