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Differential susceptibility of white fir provenances to balsam twig aphid

Differential susceptibility of white fir provenances to balsam twig aphid

Research Note Pacific Southwest Forest and Range Experiment Station, USDA Forest Service ( PSW-403): 4 pp.

Susceptibility of provenances of Abies concolor from Oregon, California, Nevada, Utah and Arizona to crown injury by balsam twig aphid (Mindarus abietinus) was assessed in a test plantation in the central Sierra Nevada, California. Bud phenology was recorded to study relations between flushing and crown injury. Highest susceptibility occurred in the Oregon provenances, which represented natural populations intermediate between A. concolor and A. grandis.

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Accession: 002072846

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