Use of botanicals in root-knot nematode control: a meta-analysis

Abstract

This meta-analysis was conducted to quantitatively analyze the efficacy of plant residues and plant derivatives of various plant species against root-knot nematodes (Meloidogyne spp.). Publications investigating root-knot nematodes control with plant-based amendments, i.e., plant residues (i.e., crop trash/stubble, pomace, oil cakes) and plant derivatives, such as extracts and powders of leaf, flower and fruit, were identified in Scopus® and ScienceDirect® databases and other literature. A meta-analysis was done by calculating the natural logarithm of response ratios of different plant-based soil amendments against root-knot nematodes. Plant residues reduced the number of root-knot nematode and its damage nearly by 49% compared to the control in general. Plant residues of Raphanus sativus (radish) and Oryza sativa (rice) demonstrated the highest root-knot nematode control, with up to 85% reduction in damage and root-knot nematode population densities when compared to the control. Leaf extracts of Allium tuberosum (garlic) and leaf powder of Laurelia sempervirens (Peruvian nutmeg) demonstrated the highest percentage reduction of root-knot nematode population densities and damage.