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Diptera.info :: Miscellaneous :: General queries
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Species feeding on common ragwort (Senecio jacobaea)
Gerrit Oehm
#1 Print Post
Posted on 31-12-2011 19:31
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Location: Germany
Posts: 163
Joined: 26.11.11

Which species feed on common ragwort (Senecio jacobaea)? (in Germany and neighbour countrys)

As I know it, there are

Lepidoptera:

- Conchylis atricapitana
- Conchylis aeneana
- Epiblema hepaticana
- Epiblema trigeminana
- Phycitodes maritima
- Phycitodes saxicolais
- Thyria jacobaeae

Chrysomelidae

- Longitarsus jacobaeae
-Longitarsus dorsalis

I found as well a member of the Lepidoptera - Hepialidae? family,
but I was not able to identify it (see attachement).

Where I live, in northern Germany, we have growing numbers of common ragwort. Consequential the population of Thyria jacobaeae, which is a Red List species here, grew.
Which is interesting is, that one regional teams of the German Society for Nature Conservation
had to combat the plant, because of its high toxcity and its expansion on grazing lands.

Gerrit
Gerrit Oehm attached the following image:


[100.19Kb]
 
Sundew
#2 Print Post
Posted on 31-12-2011 22:27
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Location: Berlin and Baden-W├╝rttemberg, Germany
Posts: 3890
Joined: 28.07.07

There are still more Lepidoptera caterpillars feeding on Senecio. S. jacobaea may not be the only food plant, other Asteraceae or even other herbs will do, too.
Your listed names are partially outdated ("Conchylis" is Cochylis, "Conchylis aeneana" is Commophila aeneana, "Epiblema trigeminana" is E. costipunctana, "Phycitodes saxicolais" is P. saxicola.)
In which plant part did you find the depicted caterpillar - was it a stem borer, a root borer, or a leaf roller? It could well belong to Tortricidae or Crambidae (there are some Udea species with rather similar caterpillars that are said to feed on Senecio; they occur, however, in alpine regions).
As I am no micro moth specialist, I recommend you the Lepiforum (http://www.lepifo...) where you surely will find expert help!
Best regards and happy New Year, Sundew
Edited by Sundew on 31-12-2011 22:28
 
Gerrit Oehm
#3 Print Post
Posted on 01-01-2012 10:47
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Location: Germany
Posts: 163
Joined: 26.11.11

A happy new year to you, too!
I found the caterpillar in the root/stem of the ragwort.

Gerrit
Gerrit Oehm attached the following image:


[186.7Kb]
 
Sundew
#4 Print Post
Posted on 01-01-2012 18:53
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Location: Berlin and Baden-W├╝rttemberg, Germany
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Very interesting - this is really a case for the Lepiforum! If you get an identification of the caterpillar, please let me know. However, it might be necessary to rear it and wait for hatching of the imago to get a sure ID.
In my lectures on poisonous plants, the taxa containing pyrrolizidine alkaloids (PA) play an important role (PA are produced in several families, especially Asteraceae and Boraginaceae), and I mention cases of insect larvae that are able to incorporate the alkaloids for self-defense. So I am, of course, interested in your caterpillar.
There is an interesting book, edited by A. Schaller (2008), Induced Plant Resistance to Herbivory. Chapter 10, written by T. Hartmann and D. Ober, is titled: "Defense by Pyrrolizidine Alkaloids: Developed by Plants and Recruited by Insects". You can google it and perhaps contact the authors. These insect larvae may well be polyphagous but prefer PA plants, among which the widely distributed Senecio species play an important role.
The horse riding centre where I use to go to tries very hard to eradicate the frequent Senecio vernalis on the grazing land, because an uptake of these plants in hay or silage might be fatal. I have never noticed caterpillars on or in the annual Senecio species, however. I shall look more closely in the coming spring!
Good luck for your studies! Sundew
 
Gerrit Oehm
#5 Print Post
Posted on 02-01-2012 12:44
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Location: Germany
Posts: 163
Joined: 26.11.11

Thank you for your help...
I posted it already in the Lepiforum...
and I am exited for the answer.
I posted it as well in the forum of
http://www.microlepidoptera.nl/
That seems a pretty good site to me as well.
I will post it if I become more answers.
 
Gerrit Oehm
#6 Print Post
Posted on 03-01-2012 18:42
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Location: Germany
Posts: 163
Joined: 26.11.11

It was determined in the Actias.de forum and the microlepidoptera.nl forum first as a Apamea sp. ,
but now, in the first mentiond forum a user (saischel)
found out which I think is the right species: Gortyna flavago
Gerrit
 
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