Evaluation of certain Hungarian plant extracts for their nematicidal properties against root-knot nematode, Meloidogyne incognita in-vitro.

The in-vitro nematicidal activity of aqueous extracts derived from different parts of nine Hungarian medicinal plants at two concentrations i.e. 1 and 2% on newly hatched juveniles mortality after 24 and egg hatching of Meloidogyne incognita after 72 hrs of exposure time revealed that larval mortality percentages generally increased with increase in plant extract concentrations tested at the exposure time. Using peppermint, tarragon and marjoram resulted in significantly higher larval mortality percentages at 1 and 2 % of concentrations that were amounted to 100 % at 24 hrs of exposure time; followed by Lemon balm at 2 % and 1 % with values of 77.7 and 66.7 %, respectively. Likewise, no hatching in eggs of M. incognita was happened when exposed to extracts obtained from these plants at the same concentrations for 72 hrs. However, observations were made on the use of valerian extract at all concentrations which showed the lowest larval mortality percentages and highest number of egg hatching.