Posted by Nosferatumyia on 25-07-2008 07:09
#2
It looks more like to be damaged by
Pegomyia (Anthomyidae) : Sphenella just do not form such a foam capsulae. The easiest way is to collect some of the infested flower heads.
Pegomyia pupates in soil leaving heads (pupae ochreous or orange), whereas
Sphenella marginata pupates in the head (puparium bean-like, shinig dorsally & matt ventrally, BLACK).