Grapevine aphid, Aphis illinoisensis (Shimer)


This is taken primarily from an extension bulletin by D. G. Pfeiffer & P. B. Schultz, entitled "Major Insect and Mite Pests of Grape in Virginia" (Va. Coop. Ext. Serv. 444-567 (1986))
The winter host of this aphid is Viburnum (black haw). Winter is passed in the egg stage, mainly around buds. Eggs hatch in early spring over a 2-3 week period. A few parthenogenetic (reproducing without males) generations occur before winged migrants leave for grapevines. Colonies of dark brown aphids develop on young shoots and leaves (Plate 16, Fig. 10). When populations are high some may feed on fruit clusters, causing some berries to drop. In fall, winged individuals are again produced; these return to viburnum and produce males and females. The sexes mate and overwintering eggs are produced.

This species is usually not important enough to necessitate specific treatments. Grapevines are of sufficient vigor to tolerate some attack and the aphids are subject to attack by predators (e.g., ladybird beetle adults and larvae, and lacewing larvae). Dry weather is conducive to buildups of aphid populations.

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