1. Institut National de la Recherche Agronomique (INRA), UR 1213 Herbivores, F-63122 Saint-Genès-Champanelle, France
2. Department AGROSELVITER, University of Turin, Via Leonardo da Vinci 44, 10095, Grugliasco, Italy
3. Institut National de la Recherche Agronomique (INRA), UE 1296 Unité expérimentale des Monts-d’Auvergne, F-63210 Orcival, France
4. Dipartimento di Scienze Agronomiche, Agrochimiche e delle Produzioni Animali (DACPA), University of Catania, Via Valdisavoia 5, 95123 Catania, Italy