“…Also, the addition of soil amendment may be providing another beneficial role such as enhancing plant growth-promoting or plant health soil microorganism, which leads to increased plant growth. The application with D. stramonium organic matter stimulated the parasitic activity of the bio-control agent Paecilomyces lilacinus against M. javanica eggs (Oduor- Owino et al, 1993Owino et al, , 2003b.The differences in valiabale toxicity may be attributed to the plant part used, application methods,active component concentration in the plant material that may be affected by several different factors such as the age of the plant, method of extraction,soil moisture and type of extracting solvent (Bakr, 2018). So that, Datura as a nematode-suppressing plant may work against RKN direct or indirect by one or more methods as follows in Figure-2.…”