author(s)
Zubair Ahmed Nizamani and Shahid Hussain

abstract
Onion (Allium cepa L.) is a queen of kitchen found all over the world. Fusarium wilt is economically significant disease caused by Fusarium oxysporum. It was first reported by Erwin F. Smith in 1894 in the United States. Though, the infection it is now widespread throughout most regions in the world the main objective is to assess the efficacy of different fungicides against linear colony of the fungus Fusarium oxysporum. All the experiments were carried out according to the Completely Randomized Block Design (CRBD) layout system. The results of the study are summarized as under Results regarding the survey of different onion field of district Hyderabad, Tandialyar and Mirpurkhas showed that the Fusarium wilt disease is frequently found in all the districts surveyed with less or more incidence. The maximum disease incidence was recorded from Hyderabad. The results of different fungicides indicated that the Fusarium wilt of onion can be managed through certain broad spectrum systematic fungicides. The fungicides used against the fungus significantly reduce the colony growth of the fungus. Among them, Topsin-M was more effective in reducing the colony growth of the fungus followed by Carbendazim whereas; Ridomil and Acrobat were found very less effective in arresting the colony growth of the fungus as compared to Topsin-M and Carbendazim.