Dysaphis apiifolia petroselini Borner Hawthornparsley aphid

This common species forms red pseudo-galls on leaves of Crataegus during the spring, and migrates in summer to the base of the stems of celery and parsley. Colonies on these summer hosts are commonly sheltered by ant-constructed earthen canopies. The aphids are similar in appearance to the more widely known Dysaphis crataegi (below) but with a distinct rust-coloured patch around the base of each siphunculus. Damage caused to primary and secondary hosts is of little or no importance but, at least under laboratory conditions, the aphids are capable of transmitting various virus diseases, including cauliflower mosaic, celery crinkle leaf and celery mosaic.

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