NEMATOTOXIC EFFECT OF THREE INDIGENEOUS PLANTS ON LARVAE HATCH OF ROOT-KNOT NEMATODE (Meloidogyne incognita)

The research was carried out in the laboratory of the Department of Crop Science, Adamawa State University Mubi (Latitude 10o16″N and Longitude 13o17″E) Nigeria. Two thousand grammes of each bark of Eucalyptus camaldulensis, Gmelina arborea and Cassia siamea were crushed, blended in an electric Phillips kitchen blender and run at 10,000 rpm for one minutes. To each, six liters of distilled water was added and regarded as standard solution (S). Adding the required amount of distilled water dilutions of S/2, S/10, and S/100 was prepared. Hatching was inhibited to varying degrees when egg masses of root-knot nematodes were introduced in these solutions. Egg-hatch inhibition increases as the concentration of the water-soluble bark extracts decreases. Significantly higher larval hatch of 89% was recorded at the control (distilled water). Though all plants bark extracts recorded low eggs hatch (2% and 4%) at S and S/2, concentration. Cassia siamea inhibit more nematodes eggs with 2% hatching at S concentratio