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Dysaphis crataegi

Hawthorn-carrot aphid

Description

The hawthorn-carrot aphid (Dysaphis crataegi) is a sap-sucking insect with a two-host life cycle. It overwinters as eggs on hawthorn trees (Crataegus spp.), its primary host. In spring, nymphs emerge and feed on the undersides of leaves, causing them to curl and form red, blister-like galls. By late spring, winged forms migrate to secondary hosts in the Apiaceae family, such as carrot (Daucus carota), parsnip (Pastinaca sativa), and parsley (Aethusa cynapium). These aphids reproduce parthenogenetically on secondary hosts, forming dense colonies that persist until late summer.

On hawthorn, infestations weaken trees and reduce aesthetic appeal by distorting leaves and causing discoloration. Dysaphis crataegi is widespread in Europe and can cause economic damage in agriculture and urban landscapes during high-density outbreaks.

Symptom

On hawthorn, leaves curl upward and develop red, blister-like galls. There is colony of aphids on the uderside of the levaes.

Tree Species: Hawthorn

Part of a plant- attacked: Leaf / Needle, Branch

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes