Sorry, Jojanneke, I should have got my brain into gear before looking
at your photo not after! It was the yellow flowers which were galled
not the seed head, of course. I think it could well be Contarinia
jacobaeae (on Senecio jacobaea) but this could be confirmed by
finding yellowish orange jumping larvae inside. The examples of this
gall that I have found have had fewer florets and a more pronounced
swelling. The Aidgap Keys say other cecids may gall Senecio flower
heads. Let's consult the experts next weekend!
Janet


In british_galls@..., "Jojanneke Bijkerk"
<jojanneke@p...> wrote:
>
> Hi Janet,
>
>
>
> I can tell you it is certainly a Senecio-species. Senecio jabocaea
(or
> Jacobaea vulgaris ssp vulgaris, as it is called nowadays) or S. Do
you mean
> allium ursinum by Crow Garlic? But if it doesn't look like C.
jacobaea, what
> else can it be? I think it is likely to be caused by a gal midge or
a gall
> mite. Can it be Contarinia aequalis? This seems to be the only left
option
> in Docters van Leeuwen (1982).
>
>
>
> Looking forward to see you at Hereford next weekend!
>
>
>
> Jojanneke
>
> _______________________________________________
> Jojanneke Bijkerk
>
> Ruiterakker 48
> 9407 BB Assen
> 0031 (0)592 268368
>
> jojanneke@p...
> www.plantengallen.com
> _______________________________________________
>
> _____
>
> Van: british_galls@...
> [mailto:british_galls@...] Namens Janet Boyd
> Verzonden: zaterdag 2 september 2006 11:25
> Aan: british_galls@...
> Onderwerp: RE: [british_galls] FW: Alder Gall?
>
>
>
> Hi Jojanneke,
> It doesn't look like C. jacobaea to me - is the host Senecio
jacobaea? I've
> not seen it before. It looks a bit like a seed head of something
like Crow
> Garlic!
> Janet
>
>
> >From: "Jojanneke Bijkerk" <jojanneke@p...>
> >Reply-To: british_galls@...
> >To: <british_galls@...>
> >Subject: RE: [british_galls] FW: Alder Gall?
> >Date: Sun, 27 Aug 2006 18:26:57 +0200
> >
> >
> >
> >Does the gall on the picture look familiar to anybody? Could it be
> >Contarinia jacobaea? I have not seen it before, but it reminds me
of
> >Rhopalomyia.
> >
> >
> >
> >Jojanneke
> >
> >_______________________________________________
> >Jojanneke Bijkerk
> >
> >Ruiterakker 48
> >9407 BB Assen
> >0031 (0)592 268368
> >
> >jojanneke@p...
> >www.plantengallen.com
> >_______________________________________________
> >
> >_
> >
> ><< image002.jpg >>
>