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Cultivated for its fruit, tomato is subject to attack by root-knot nematodes which cause huge production losses. This study helps improve tomato production by controlling root-knot nematodes using Alliaceae extracts. To this end, phytosanitary surveys carried out in tomato fields in the Autonomous District of Yamoussoukro made it possible to establish the symptomatology caused by root-knot nematodes on tomatoes and to collect samples. Nematodes were extracted from soil and tomato root samples respectively by the Whitehead tray and Baermann maceration methods, then identified and quantified. The in vitro and in vivo effectiveness of garlic and onion aqueous extracts was assessed on root-knot nematodes. Root galls, chlorosis and reduction of the root system were observed on tomato plants of varieties PADMA and COBRA 26 with prevalence and severity higher than 50%. Meloidogyne sp. was the main nematode extracted from tomato soils and roots. Garlic extract developed greater nematicidal activity, that is, 55.52% mortality than that of onion extract (29.04%). However, treatments carried out in vivo, with both garlic and onion extracts reduced root gall development and improved tomato plant development. There is therefore an agronomic advantage in combining garlic and onion extracts in the control of Meloidogyne sp. infections in tomato.

indian journal of pure and applied biosciences

Effectiveness of Garlic and Onion Aqueous Extracts on Tomato Root-Knot Nematodes (Meloidogyne sp.) in the Autonomous District of Yamoussoukro in Central Côte d’Ivoire