Phyllaphis

Koch, 1856

woolly beech aphids

Species Guides

Phyllaphis fagi(Woolly Beech Aphid)
Phyllaphis grandifoliae

Phyllaphis is a of woolly aphids in the Aphididae, established by Koch in 1856. The genus comprises at least four described , with Phyllaphis fagi and P. grandifoliae commonly known as woolly beech aphids. Species in this genus are associated with beech trees (Fagus spp.) and exhibit complex with multiple per growing season. The genus has been subject to taxonomic revision, with some species historically placed in related genera such as Tamalia.

Phyllaphis fagi by (c) agujaceratops, some rights reserved (CC BY), uploaded by agujaceratops. Used under a CC-BY license.

Phyllaphis by (c) Stephan Mende, some rights reserved (CC BY), uploaded by Stephan Mende. Used under a CC-BY license.

Pronunciation

How to pronounce Phyllaphis: /ˈfɪləfɪs/

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Images

Habitat

Forest and nursery environments where beech trees occur. At least one , Phyllaphis fagi, has been documented in forest nurseries where situations occur.

Distribution

Documented from Denmark, Norway, and Sweden based on GBIF records. Distribution likely broader in regions where beech trees (Fagus spp.) are native or cultivated.

Seasonality

Phyllaphis fagi exhibits hatch before budburst of trees. Ten have been recorded during a single growing season in nursery conditions. Winged morph formation continues for several months with peak activity in mid-June.

Diet

Phloem feeding on beech trees. Phyllaphis fagi is specifically associated with Fagus sylvatica (European beech).

Host Associations

Fagus sylvatica - primary European beech; documented of Phyllaphis fagi
Fagus - -level association-level association inferred from 'woolly beech aphid' and epithets

Life Cycle

Holocyclic with . Egg hatch occurs before budburst. Multiple parthenogenetic (up to ten per season) followed by and egg deposition. Development time, nymph mortality, and vary by temperature and generation. Winged morphs (alatae) form across multiple generations rather than being restricted to specific generations.

Behavior

Newly hatched nymphs are highly active in searching for feeding sites, resulting in elevated first- mortality. Winged morph formation peaks in mid-June and continues for several months, facilitating to new seedlings. Both and females have been observed to have similar reproductive effort.

Human Relevance

Phyllaphis fagi is a pest of forest nurseries where situations can develop. High reproductive potential throughout summer creates risk for seedling damage. Winged morphs migrate to new seedlings, spreading within nurseries.

Similar Taxa

TamaliaHistorical taxonomic confusion; Tamalia coweni was previously classified as Phyllaphis coweni. The two can be distinguished by cytological and morphological characteristics.

More Details

Taxonomic history

The has undergone taxonomic revision. Tamalia coweni was originally described as Phyllaphis coweni but later moved to Tamalia based on cytological and morphological evidence. This indicates Phyllaphis as historically defined may have been polyphyletic or contained now recognized as belonging to distinct lineages.

Temperature sensitivity

Laboratory studies on Phyllaphis fagi show optimal growth rate (r_m) at 20°C. Nymphs born at 25°C sometimes exhibit deformities and reduced survival. The first shows less temperature sensitivity than subsequent generations.