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Notes: Aphids Feeding on Mycorrhizae of Douglas-Fir

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Aphids, probably Pemphigus piceae Htg., were observed feeding directly on mycorrhizae of second-growth Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) in western Oregon. Infestations were heaviest on mycorrhizae growing within fallen, decaying trunks of Douglas-fir. A similar aphid was also found feeding on mycorrhizae of seedling Tsuga heterophylla (Raf.) Sarg. and Picea sitchensis (Bong.) Carr. Attack varied according to type of mycorrhiza, suggesting that some fungal symbionts may secrete an attractant, others a repellent. In contrast, a second aphid, Prociphilus americanus Wlk., was observed feeding on suberized roots, but not mycorrhizae, of Abies procera Rehd.
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Document Type: News

Affiliations: Staff of the Pacific Northwest Forest and Range Expt. Sta., Forest Service, U.S. Dept. Agric., Portland, Ore.

Publication date: 1965-12-01

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  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

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    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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