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Nematicidal effects of some plant oils against root-knot nematodes (Meloidogyne incognita) (Kofoid ve White, 1919)  [2009]

Yarba, M.M., Sütçü İmam Univ., Faculty of Agriculture, Kahramanmaraş (Turkey) Sütçü İmam University, Graduate School of Natural and Applied Sciences, Kahramanmaraş (Turkey) [Corporate Author]

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This research was conducted to evaluate effectiveness of five plant oils (three essential oils (rosemary, thyme, mint) and two plant oils (garlic, sesame)) against root knot nematode (Meloidogyne incognita) in 2006-2009. Trial was designed as randomized complete block design with two different nematode inoculum densities (1000, 2000) J2/pot and two different essential oil concentrations (50, 150) pot/l replicated six times. There were no significant differences between nematode inoculum densities and oil volumes used. However, all oil treatments suppressed nematode populations and resulted an increase in root mass tissue. Compared with control groups, among the oils, thyme (%2.82) and garlic (%5.53)yielded the lowest galling on the roots when their contacts with plant tissues were avoided during the applications. Rosemary, mint, and sesame treatments were less effective in reducing galling. Compared with control groups, thyme (2.46)and garlic (2.50) yielded again the lowest egg masses. Such oil studies conducted in control conditions need to be repeated in the field and greenhouse conditions to see the possible differences because nematodes and essential oils could be influenced by different experimental conditions. Application of a rate of 50 μl/plant of thyme and garlic essential oils in the field or greenhouses could give the best results in root nematode control and be a alternative to the current nematicides.