Gonioctena fornicata

It is a univoltine species. It overwinters as an adult in the ground. After mating, the females lay their eggs on the leaves. The larvae develop in about 3–4 weeks. The new generation of adult beetles appears at the beginning of spring. Both beetles and larvae mainly feed on the tender leaves and stem of the alfalfa plant (Medicago sativa), Trifolium and other Fabaceae species.^[4]

Generally chemical control using insecticides is not suggested but trials were done anyway. Unfortunately the field application of Bacillus thuringiensis subs. tenebrionis (Btt) is not possible due to lack of registration (e.g. in Italy). The good efficacy of the Btt preparation on adults and larvae was tested in lab. The microbial control with Btt could be very useful in alfalfa open fields on the contrary the chemical insecticides (e.g. neonicotinoids, etc.) due to the negative side effects on beneficial insects (very numerous in alfalfa) must be avoided. ^{[5] [6]}