His main work was Contributo allo studio della fauna entomologica Italiano.
Elenco sistematico degli Emitteri finora raccolti nella Provincia di Roma.
[1] This treatise is a catalogue in systematic order of 423 species in 229 genera and 24 families of Hemiptera from the Province of Rome with full references as a contribution to an entomological fauna of Italy.
A meticulous entomologist and specialist Picco lists the works he used for determinations principally monographs by Franz Xaver Fieber, Étienne Mulsant and Charles Jean-Baptiste Amyot.
Conci, C. 1975: Repertorio delle biografie e bibliografie degli scrittori e cultori italiani di entomologia.