Yellowheaded spruce sawfly: Its ecology and management. Forest Service general technical report
The yellowheaded spruce sawfly (YHSS), Pikonema alaskensis (Rohwer), (Hymenoptera: Tenthredinidae), defoliates spruce, Picea sp., throughout the Northern United States and Canada. YHSS defoliation can result in substantial growth reduction and tree mortality. Young, open-grown trees, 3 to 18 feet in height and 5 to 9 years old, are more vulnerable to YHSS damage than are understory trees, older trees, or trees in dense stands. Young plantations and naturally regenerated stands of spruce YHSS defoliation, particularly in the Great Lakes region. Many Christmans trees, nursery stock, roadside and windbreak trees, and ornamental spruce are also damaged. Susceptibility to YHSS drops sharply once trees reach 10 to 12 years of age and stands reach the stage of crown closure.
- Research Organization:
- Forest Service, St. Paul, MN (United States). North Central Forest Experiment Station
- OSTI ID:
- 239095
- Report Number(s):
- PB-96-165295/XAB; FSGTR-NC-179; TRN: 61341335
- Resource Relation:
- Other Information: PBD: 14 Dec 1995
- Country of Publication:
- United States
- Language:
- English
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