Figure 2. The relative proportion of behaviours exhibited by apterous adults of three aphid species (Metopolophium dirhodum (n = 51) indicated by the dark grey bars, Rhopalosiphum padi (n = 51) indicated by the black bars, and Sitobion avenae (n = 53) indicated by the light grey bars) when subjected to a declining temperature regime from 20°C to −10°C at 0.75°C min^-1.

Behaviours include: 1) the aphid actively left the host plant; 2) the aphid fell from the host plant as a result of chill coma; 3) the aphid remained attached to the host plant to temperatures of −10°C.