Plant Parasites of Europe

leafminers, galls and fungi

Cupressatia siskiyou

Cupressatia siskiyou (Felt, 1917)

on Chamaecyparis

Cupressatia siskiyou: gall in Chamaecyparis spec. cone

Chamaecyparis spec., Belgium, prov. Antwerp, Mol © Carina Van Steenwinkel

Cupressatia siskiyou: gall in Chamaecyparis spec. cone

the larva forms itself a cavity in the developing seed

Cupressatia siskiyou: gall in Chamaecyparis spec. cone

several larvae in a cone

Cupressatia siskiyou: cocoon in gall

Chamaecyparis lawsoniana, Denmark © Simon Haarder: cocoon in opened, galled cone

Cupressatia siskiyou: larva and disfigured seed

larva and disfigured seed

Cupressatia siskiyou: spatula



The cones are somewhat malformed and discoloured. The seeds are distorted, because a cavity has been formed in which a larva lies. The young larva is pale yellow, later it turns orange. The larva hibernates in a coccon in the gall, and pupates there in spring.

host plants

Cupressaceae, monophagous

Chamaecyparis lawsoniana.


Jaapiella, Janetiella, siskiyou; Craneiobia lawsonianae de Meijere, 1935.

parasitoids, predators

Torymus janetiellae.


Like its host plant originally a North American species. The first European records were in the Netherlands in 1931 (de Meijere, 1935a).


Barnes (1951a), Burton, Carbonnelle, Ellis & Schneider (2019a), Dauphin & Aniotsbehere (1997a), Gagné (2010a, 2013a), Gagné & Jaschhof (2014a), de Vere Graham & Gijswijt (1998a) , Haarder, Bruun, Harris & Skuhravá (2016a), Harris (2004a), de Meijere (1935a), Nijveldt (1984a), Redfern & Shirley (2011a), Roskam (2009a), Roskam & Carbonnelle (2015a), Skuhravá & Skuhravý (2009b, 2021a: 76), Skuhravá, Skuhravý, Dauphin & Coutin (2005a), Skuhravá, Skuhravý & Jørgensen (2006a), Skuhravá, Skuhravý & Meyer (2014a), Skuhravá, Skuhravý, Skrzypczyńska & Szadziewski (2008a).

Last modified 5.v.2022