Victoria's top prosecutor has lodged an appeal against Borce Ristevski's nine-year jail term for killing his wife Karen, on the basis the jail term is "manifestly inadequate".

Ristevski was last month sentenced to nine years in prison, and to serve six years before he became eligible for parole, after pleading guilty to manslaughter over the death of his wife of 27 years.

Borce Ristevski arrives at the Supreme Court to be sentenced for manslaughter over his wife's death. Credit:AAP

With time in jail already served, the jail term imposed by Justice Christopher Beale on April 18 meant Ristevski, 55, could be out on parole before his 60th birthday, in a sentence that angered Karen's family, caused public outcry and frustrated police.

Prosecutors had four weeks from that sentence date to appeal against Justice Beale's ruling, and on Monday the Director of Public Prosecutions, Kerri Judd, QC, confirmed her office had appealed against the duration of both the full and non-parole terms.