Abstract
Field experiment was conducted in 2024 rainy season to compare the effect of different plant leaves powders on root knot nematode (Meloidogyne incognita) affecting Bambara groundnut (Vigna subterranea) in Adamawa State. Completely randomized and split-plot in randomized complete block design were used. Soil solarization was used to sterilize soil and four varieties of Bambara groundnut were used and sown two per hole at 2 cm depth of soil and thinned to one at 14 days after planting. Nematode obtained was extracted and inoculated around plant roots. Data collected on growth and yield characters were subjected to Analysis of Variance to compare differences between variables. Means were separated for significance at 95% (p=0.05) Least Significant Differences. Plants treated with leaf powders gave best measuring 300g leaf powder by increasing growth and yield compared to the untreated. Among leaf powder, V. amygdalina gave the best result by inhibiting nematode population in soil, roots and reducing galls formed. Among the plant cultivars, Zebra gave high yield compared to others. Among concentrations, 300g leaf powder proves more effective in reducing nematode population in the soil, roots and number of galls. The use of plant leaf powders proved effective and should be encouraged as effective nematicides against nematode.