Abstract
Taify grapes is one of the most important and famous summer fruit in Taif region, Saudi Arabia. Root knot nematodes classified as one of the most important pests that can cause serious damage to grapevines. There is a need to develop alternative, environmentally friendly management strategies for this pest. A greenhouse trial was carried out to evaluate the effect of plant extracts and entomopathogenic bacteria against root-knot nematode infecting Taify grapevine. Results revealed that neem leaves extract at the three concentrations tested significantly optimized total plant fresh and shoot dry weights of grapevine with increase percentage values ranged from 74.7 to 141.1 and 88.1 to 144.8%, respectively. Grapevine plants treated with neem showed over 92.9 % nematode reduction in soil. The same trend was observed regarding cell-free conditioned media of entomopathogenic bacteria, Xenorhabdus sp. since it significantly maximized whole plant fresh weight up to 79.5% and reduced nematode population up to 97.1%.