Abstract
The development of an automated aphid flight chamber has enabled flight behaviour to be distinguished and quantified as migratory, when the insect flies persistently upward and ignores laterally presented plant-mimicking visual stimuli, or foraging, when the insect readily interrupts its upward flight and moves towards the plant-like cue (David & Hardie, 1988; Nottingham & Hardie, 1989). Winged summer (alate virginoparae) and autumn (gynoparae) forms of the black bean aphid, Aphis fabae Scop., differ in their flight strategies: the autumn forms show a long period of migratory behaviour at the beginning of the maiden flight while summer forms do not. It is possible to modify this behaviour and promote the appearance of foraging flight by hormonal and anaesthetic treatments (Hardie et al., 1989). In the field, aphid flight may be delayed by weather conditions leaving the insects on plants unsuitable for feeding.
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