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Phyllaphidinae : Phyllaphini : Phyllaphis grandifoliae


Phyllaphis grandifoliae

American woolly beech aphid

On this page: Identification & Distribution Other aphids on the same host

Identification & Distribution

Adult apterae of Phyllaphis grandifoliae (see pictures below) are pale greenish, pale yellow or somewhat cream-coloured. They are usually covered with white waxy filaments. Antennal segment II is 1.2-1.5 times longer than antennal segment I (cf. Phyllaphis fagi, which has antennal segments I & II more or less equal in length). The dorsum has weakly pigmented spinal, pleural and marginal sclerites on all tergites. On abdominal tergite VIII the bases of hairs are surrounded by wax gland pores in form of cribriform (= pierced with small holes) discs (cf. Phyllaphis fagi, where the bases of the hairs on abdominal tergite VIII are surrounded by wax gland pores in the form of double-contoured rings). Marginal and spinal tubercles are absent. Abdominal tergite VII has 2-4 hairs that are 26-42 μm long. Siphunculi are present as small pores. The cauda is small, rounded or weakly knobbed, with 2 hairs. The body length of adult Phyllaphis grandifoliae apterae is about 1.8 mm.

First image above copyright (2010) Her Majesty the Queen in Right of Canada, Agriculture & Agri-Food Canada.
Second image above by permission, copyright Claude Pilon, all rights reserved.

Immature Phyllaphis grandifoliae (see picture below) are pale yellow-green with abundant fine wax filaments. The alate viviparous female is unknown, and perhaps does not occur (Richards, 1973).

Image above by permission, copyright Claude Pilon, all rights reserved.

Phyllaphis grandifoliae is found on American beech (Fagus grandifolia). Sexual forms develop in autumn. The oviparae have pale siphunculi and lack dorsal abdominal cross-bars. The species is found in eastern USA and eastern Canada.


Other aphids on the same host

Phyllaphis grandifoliae has only been recorded on 1 species of beech (Fagus grandifolia).

Blackman & Eastop list 5 species of aphid as feeding on American beech (Fagus grandifolia) worldwide, and provide formal identification ke?s (Show World list). Of those aphid species, Baker (2015) lists 1 as occurring in Britain (Show British list).


We are especially grateful to Claude Pilon for pictures of Phyllaphis grandifoliae (for more of her excellent pictures see and).

Identification of specimens photographed by Claude Pilon was confirmed by Eric Maw by microscopic examination of preserved specimens. For taxonomic details we have used the keys and species accounts of Richards (1973) and Quednau (2010) together with Blackman & Eastop (1994) and Blackman & Eastop (2006). We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. For assistance on the terms used for aphid morphology we suggest the figure provided by Blackman & Eastop (2006).

Useful weblinks


  • Quednau, F.W. (2010). Atlas of the Drepanosiphine aphids of the world. Part iii. Memoirs of the American Entomological Institute 83, 1-361.

  • Richards, W.R. (1973). A review of Phyllaphis, with a description of a new species from Ontario (Homoptera: Aphididae). Canad. Ent. 105, 1573-1581. Abstract