ABSTRACT A research to study the influence of time of applica- tion and kind of sistemic fungicide on Alternaria porri (Ell) Cif disease and yield of low land onion plant (Allium sativum L.) held on March 1996 until May 1996 in Girirejo, sub district Tegalrejo, Magelang Regency at the Latosol soil with pH 6, 5, 320 meters above the sealevel. The research is factorial trial (4x3) wit…