Acyrthosiphon pisum Harris Pea aphid

This species is a widespread and common pest of culinary pea (Plate 2a) and certain other cultivated legumes, including field bean and sweet pea; the aphid is also a virus vector. Most damage is caused to the growing points during June and July, with leaves and pods becoming distorted and turning yellow; heavy infestations on culinary peas will reduce yields significantly. Pea enation mosaic virus, pea leaf roll virus and pea mosaic virus are introduced and spread by this insect.

BIOLOGY

Adults and eggs overwinter on perennial legumes such as clover, lucerne and trefoils. Colo

7Pseudo-pupae parasitized by the glasshouse whitefly parasitoid (Encarsia formosa Gahan) are black.

nies develop on these plants in the spring; winged forms are produced relatively early in the season, and these migrate to peas and beans from May onwards. These immigrants infest the growing points, and infestations are often overlooked until colonies build-up on the foliage or developing pods. The aphids, which drop readily to the ground when disturbed, often form significant infestations in June and July; colonies on summer hosts usually persist until the autumn.

DESCRIPTION

Aptera 2.5-4.0mm long; body elongate, pale green to yellowish or pinkish; antennae, legs and cauda long, slender; siphunculi very long, slender and dark tipped (Fig. 188a); head deeply indented (Fig. 189a). Nymph similar to adult but with a slight waxy coating.

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