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Notes: Aphids Feeding on Mycorrhizae of Douglas-Fir

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Abstract:

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.

Document Type: News

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

Publication date: December 1, 1965

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