Dysaphis crataegi Kaltenbach Hawthorncarrot aphid

This aphid overwinters in the egg stage on Crataegus, where spring colonies of blackish aphids, lightly dusted with wax, form conspicuous, deep-red pseudo-galls on the leaves. Winged aphids later migrate to wild and cultivated carrot, where they initiate dense, ant-attended colonies of wingless aphids on the tap root and leaf bases; aphids also occur in summer on parsnip (Plate 2c), as a separate subspecies: Dysaphis crataegi kunzei (Borner) = hawthorn/ parsnip aphid. In the autumn, winged forms are produced, and these return to Crataegus where winter eggs are laid. Apterae on carrot and parsnip are 1.4-2.6mm long, yellowish-grey, greenish-grey or pinkish-grey, and lightly dusted with wax; the siphunculi are relatively short and distinctly tapered.

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