Janetiella siskiyou

Cecidomyiidae

Cupressatia

Chamaecyparis lawsoniana

California

Oregon

Cupressatia siskiyou

Janetiella siskiyou Felt (Keen 1958) damages seeds of Chamaecyparis lawsonuma in Oregon. 

Western Forest Insects

Janetiella siskiyou

Infested cones may appear normal to slightly deformed
Larvae among the scales. They spin a cocoon in summer and pupate there in spring. Adults emerge shortly after.. Probably only one generation occurs per year.

Host: Chamaecyparis lawsoniana
Distr: Oregon; also Europe, where it is now well established

The plant-feeding gall midges of North America

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.