Pests

Hop aphid on hops

Humulus lupulus L.

The hop aphid (Phorodon humuli) is a specialized pest of hops that damages leaves and inflorescences. Mass infestation leads to cone deformation and the development of sooty mold on the pest's secretions, which reduces alpha-acid content.

In the reference 9 varieties crop Common hop, where this is mentioned in the description.

The hop aphid is a heteroecious species, for which common hop serves as the sole secondary summer host. The pest is localized primarily on the underside of leaves and also infests inflorescences and developing cones, causing them to curl, yellow, and stunting plant development.

During feeding, the aphid secretes honeydew, which becomes a favorable medium for the growth of sooty mold, critically reducing the market value of the crop. Damage to the cones leads to their deformation and a significant drop in the alpha-acid content essential for the quality of hop products.

General information about the subject — on the page Aphids.

Sources8

Varieties of Common hop mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.