Synonyms and other taxonomic changes
Ditula rotundana (Haworth, 1811)
Tortrix angustiorana Haworth, 1811
Ditula dumeriliana (Duponchel, 1836)
Explanation of Names
Specific epithet angustiorana is from Latin meaning "narrower."
Larva - mature larvae up to 14 mm long. Head, brownish yellow with distinct ocellar area and lateral bar on cheek. Thoracic shield usually yellowish, grading to brownish laterally. Body, yellowish green above spiracular line creamy yellow below. Faint green middorsal stripe.
In Canada this species is restricted to south coastal British Columbia; it also occurs south along the coast to California and throughout Europe.
The principal coniferous hosts of Ditula angustiorana are Douglas-fir, western yew and common yew; other hosts include Garry oak, ivy, boxwood and apple.
This species overwinters as a young larva. Larval feeding resumes in spring and continues until June. Pupation occurs in June, and adults emerge from June to July. Eggs are laid in shingle like masses on host foliage.