In vitro nematicidal activity of different seaweed extracts against Meloidogyne javanica (Tylenchida: Heteroderidae)

The different types of seaweeds viz., Caulerpa racemosa, Caulerpa scalpelliformis, Ulva fasciata, Padina tetrastromatica, Stoechospermum polypodioides, Sargassum wightii, Cheilosporum spectabile and Gracillaria edulis were collected and processed for the extraction. The effect of methanol extract of different seaweeds was studied on the larvae of Meloidogyne javanica at different exposure of time (24 hrs, 48 hrs, 72 hrs). The test seaweed extract were taken into two different concentrations (2 mg/ml, 4 mg/ml). Stoechospermum polypodioides showed high nematicidal activity in both the concentrations of methanol extract of test seaweeds. U. fasciata were found to be least active in its nematicidal activity than the other seaweeds. The present finding brings out new insight in the development of ecofriendly bio-pesticides for the management of root-knot nematodes.