Antagonistic Effect of Nanoemulsions of Some Essential Oils against Fusarium oxysporum and Root-Knot Nematode Meloidogyne javanica on Coleus Plants
Antagonistic Effect of Nanoemulsions of Some Essential Oils against Fusarium oxysporum and Root-Knot Nematode Meloidogyne javanica on Coleus Plants
Eman Alsayed Hammad1* and Mahmoud Mohamed Hassanin Hasanin2
ABSTRACT
Efficacy of nanoemulsions and emulsions of thyme and spearmint essential oils were examined as an alternative to chemical control for suppressing Meloidogyne javanica and Fusarium oxysporum on coleus plants, Coleus forskohlii in vitro and greenhouse conditions. Nanoemulsions of thyme (droplets size was in the range of 25.4–32.9 nm) and spearmint (droplets size was in the range of 5.91–9.77 nm) at concentrations 4000 and 5000ppm separately, recorded the best results in vitro investigations, completely prevented F. oxysporum growth at all concentrations, and increased M. javanica mortality by 100%, in comparison to the non-treated control. In the greenhouse, thyme and spearmint essential oils nanoemulsions and emulsions (at 5000 ppm) affected significantly on the final population (Pf) of M. javanica (671.8 and 1072.4), while emulsions of spearmint and thyme nanoemulsion completely infection prevented after 50 days from planting in infested soil with F. oxysporum, but thyme and spearmint essential oils nanoemulsions and emulsions recorded effect on Pf about 1193.6 and 1465.6, respectively, compared to Fenamiphose (328.4) and fungicide, Occidor 50% SC was completely infection prevented. A similar pattern was discovered in a greenhouse with a positive effect on increased shoot dry weight for coleus plants, where thyme and spearmint essential oil nanoemulsions at (5000ppm) achieved 3.3 and 3.9 g/plants for root-knot nematode infected plants, respectively, compared to 2.7 and 4.4 g/plants for F. oxysporum infected plants.
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