|scientific name Dioryctria abietivorella |
common name Fir Coneworm
Coniferous forests throughout range.
Adults fly July - September.
Wingspan 10.0-13.0 mm. Lacking raised scales. Forewings primarily black and white with prominent a discocellular spot. Small beige patch in subbasal area but lacking reddish scales throughout wing. Male genitalia: Uncus with slight constriction. Valve with a prominent apical projection and accessory spine. Vesica with a large cornutus and many smaller cornutii. Female genitalia: Sclerotized ductus bursae with a longitudinal membranous region. Pheromones: Blend of Z9 E11-14Ac 100 + Z9 E12-14 Ac 1. Additional components may be present.
Adults emerge and lay eggs under scales of new cones or under bark. Larvae will feed internally on cones, needles, twigs and under the bark of the host. Feeding sites can be recognized by the accumulation of webbing and frass around the entrance hole or around needles and twigs forming a loose shelter. Pupation occurs in host. Population numbers may reach infestation levels, especially in seed orchard environments.
Not a concern. Larvae are economic pests particularly in seed orchard environments.
Recorded from a wide range of coniferous hosts. Fir, spruce, and Douglas-fir are the primary hosts, though larvae have also been recorded from various pine species.
Found transcontinentally. Recorded throughout southern Canada and south to California and North Carolina, though absent from the central plains. ( Leidy and Neunzig 1986; Neunzig 2004).
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