Technical Bulletin for: Information Technology Solutions Spruce Seed Moth Cydia strobilella (Linnaeus) • Lepidoptera, Tortricidae •CYDSTR DISTRIBUTION Across North America and Europe HOSTS Silver Fir, Serbian and Norway Spruce, and Scots Pine DESCRIPTION Adult Wingspan is 10-15 mm. Forewings are dark brown and the hindwings are a lighter beige color. Larvae White throughout with an amber head. Eggs Adults fly in May, or around the time spruce pollen is shed, and lay a single egg per cone if cones are plentiful. On hatching, the larva initially tunnels in the cone scales and then moves deeper to feed on the developing seeds. In late June, the larva makes a narrow tunnel down the axis of the cone from which it feeds. When full grown in the fall it is about 10 mm long. It LIFE HISTORY hibernates in the central tunnel in the cone and pupates in the spring, the adult moths emerging from the pupal cases in about 18 days. Some of the larvae do not change to pupa in the first spring but remain dormant for 1 or more years. It seems that the number of adults present in any year correlates with the number of cones developed. MONITORING INFORMATION LURE ACTIVE INGREDIENTS, E8-12Ac in a Red Rubber Septum. Lure longevity: 30 Days. SUBSTRATE & FIELD LIFE TRAP TO USE Red Paper or Plastic Delta Trap MONITORING STRATEGY Check with local Forestry Service for information and recommendations Infested and susceptible spruce can be removed from the overstory to encourage regeneration of a new, healthy, vigorous forest. Partial cuts can be used to remove infested and susceptible CULTURAL & PHYSICAL trees to improve the growth of the residual stand. Trap trees, green trees of large diameter (>46 CONTROL cm), can be felled before adult flight to attract flying beetles. Trap trees must be removed from forests before the brood completes development and emerges. .