Invitro Evaluation Of Neem Tree Seed Oil Against Fungal Growth Of Fusarium Oxysporum. F. Sp. Lycopersici, The Causal Agent Of Tomato Wilt Disease.

Abstract

Fusarium wilt considered as one of the most important diseases of tomato in Sudan. The present investigation was undertaken under laboratory conditions to study the effect of different neem oil concentrations, and synthetic fungicide,(AmistarTop 200ml/100L Water), on growth of the fungus Fusariumoxysporumf. sp. Lycopersicithe causal agent of wilt disease on tomato. Three concentrations of neem oil (1.5, 2.5 and 3.5 %) and fungicide as recommended dose were tested in addition to control. The assessment of theirinhibitory effect against the pathogen was expressed as fungal growth inhibition percentage after six days of treatment. The results obtained showed that neem oil at alltested concentrations (1.5, 2.5, 3.5 (%) as well as the fungicide reduced significantly (P