Aceria calaceris

Proteoteras willingana

Dasineura swainei

Thecodiplosis piniradiatae

Contarinia coloradensis

Cupressatia siskiyou

Eriophyes calaceris

The purple erineum maple mite, E. calaceris (Keifer), causes dense, magenta-colored, hairlike growths on the underside [sic] of leaves of Acer glabrum.

Proteoteras willingana 

The boxelder twig borer, Proteoteras willingana (Kearfott) (Peterson 1958), is a pest of boxelder grown in shelterbelts and as shade trees in the Great Plains, especially in Saskatchewan, Alberta, and North Dakota. The larvae destroy dormant buds in the fall and early spring and then burrow in the developing shoots, causing spindle-shaped galls. Repeated attacks cause excessive branching. Larvae are yellowish white with brown to almost black heads. Larvae, mostly fourth-instar, spend the winter in cocoons in hollowed-out, dormant leaf buds. There is one generation annually. 

The spruce bud midge, Rhahdophaga sivainei Felt (Clark 1952), occurs in Alberta, Yukon, Northwest Territories, and eastward. It mines the vegetative buds of Picea glauca and P. mariana causing multiple branching. This species, or a similar one, attacks young Picea sitchensis in coastal British Columbia.



The Monterey pine midge, Thecodiplosis piniradiatae (Snow and Mills), works at the base of the newly formed needles of Monterey pine and other pines in central California and causes them to become swollen and shortened (fig. 246). Sometimes heavily infested twigs are killed and the ornamental value of the trees is impaired.

The pine budgall midge, Contarinia coloradensis Felt, forms apical budlike swellings on twigs of ponderosa pine in Colorado.


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

Western Forest Insects