Hawthorn-carrot Aphid agg. - Dysaphis crataegi agg.
The aphid Dysaphis crataegi causes galls to form on the leaves of Hawthorn (Crataegus sp.) in spring. The gall takes the form of a crimson or purplish red upward bulge (not affecting the whole leaf) ? this bulge contains the aphids. The aphids migrate to umbellifers (Apiaceae) in summer. There are several species in this group that require detailed examination by an expert and we have therefore decided to include these as Dysaphis crataegi aggregate.
Wherever the host plants are present.
Aphids are usually present on Hawthorn in April and May before migrating to umbellifers. The Hawthorn galls persist whilst the plant is in leaf.
It is difficult to determine the exact status in Britain due to lack of records.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015