[Syrphidae] Question on males

[ximo mengual sanchis]

Dear all,

recently a botanist asked me about behavior regarding syrphid males. He did
read  that some Syrphid males in Europe visit larval host plants with
aphids, probably to search for females (?).

Do you know any reference or citation about this male behavior?
Rotheray and Gilbert (2011, pag. 7) mentioned that "some males patrol
flowers when searching for a mate..." but not that those plants are
infested with aphids.

Many thanks in advance.

Best,

Ximo
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