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Do host alternating aphids know which plant they are on?

Abstract. 1 To determine whether an aphid is ‘aware’ of which plant it is on, clones of a host alternating aphid, Cavariella aegopodii Scop., reared on its primary (Salix) or secondary (Daucus) host, were subjected to autumnal conditions. 2 Old clones produced males and egg laying females when exposed to autumnal conditions on the primary host but autumnal migrants and males when on the secondary host. 3 Unlike some other host alternating aphids, Cavariella did not have to spend a period on the secondary host or go through the spring migrant stage before producing sexuals. 4 The adaptive significance of a host alternating aphid being ‘aware’ of which host plant it is on is discussed in the light of these results.