Chemical constituents and biological activities of Pyrethrum cinerariifolium nematicidal activities and identification of a biocontrol bacterium YC-10 strain Extraction and Structure Analysis of the Nematicidal Active Substances Produced by Bacillus amyloliquefaciens JK-JS3 Variance Analysis of Streptomyces Venezuelae Snea253 Mutants against Meloidogyne Incognita RELATIONSHIP BETWEEN MOLECULAR STRUCTURE AND NEMATICIDAL ACTIVITY OF QUINOLIZIDINE ALKALOIDS NEMATICIDAL ACTIVITY OF ALOPERINE AGAINST PINE WOOD NEMATODES Progress of researches on activity of Bacillus thuringiensis against plant-parasitic nematodes Using nematicidal plant resources to control plant parasitic nematodes