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I saw a dozen caterpillars of the Glanville Fritillary in the Rhone (69) in France feeding and resting on plantain. Here is a couple of pictures.
The caterpillars are very active during the day and can be found easily on this site which I visited twice already. I did find about the same number of caterpillars back in 2015, always on plantain and at the end of June.
Does anybody know whether there are 2 generations in France?
Sylvie

Sylvie, according to Tristan Lafranchis in his book Les Papillons de Jour de France, Belgique et Luxembourg et leurs Chenilles, the biology of this species in relation to broods is:

Vol: avril - juin puis juillet - septembre en 2 générations en plaine. Une seule génération en été en montagne.

Great observations and insights, both; I did not know that!

Cheers,

- Pete

Merci David pour l'info.
It does make sense as the site is 'en plaine', alt about 200m.
Sylvie

In Var, I have seen the adults in both May and September, and the caterpillar in July. I've seen the caterpillar in northern France in mid-April.

The excerpt from Lafranchis that David quotes suggests the butterfly is bivoltine right across (lowland) France; does this include the populations on the French north coast and, if so, do the Isle of Wight populations ever try to fit in a second brood?