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Nacobbus aberrans  ranks among the “top ten” plant-parasitic nematodes of phytosanitary importance. It causes significant losses in commercial interest crops in America and is a potential risk in the European Union. The nematicidal and phytotoxic activities of seven plant extracts against  N. aberrans  and  Solanum lycopersicum  were evaluated in vitro, respectively. The chemical nature of three nematicidal extracts (EC 50,48h  ≤ 113 µg mL −1 ) was studied through NMR analysis. Plant extracts showed nematicidal activity on second-stage juveniles (J2): (≥87%) at 1000 µg mL −1  after 72 h, and their EC 50  values were 71.4–468.1 and 31.5–299.8 µg mL −1  after 24 and 48 h, respectively. Extracts with the best nematicidal potential (EC 50,48h  < 113 µg mL −1 ) were those from  Adenophyllum aurantium ,  Alloispermum integrifolium , and  Tournefortia densiflora , which inhibited  L. esculentum  seed growth by 100% at 20 µg mL −1 . Stigmasterol ( 1 ), β-sitosterol ( 2 ), and α-terthienyl ( 3 ) were identified from  A. aurantium , while  1 ,  2 , lutein ( 4 ), centaurin ( 5 ), patuletin-7-β- O -glucoside ( 6 ), pendulin ( 7 ), and penduletin ( 8 ) were identified from  A. integrifolium . From  T. densiflora  extract, allantoin ( 9 ), 9- O -angeloyl-retronecine ( 10 ), and its N-oxide ( 11 ) were identified. The present research is the first to report the effect of  T. densiflora ,  A. integrifolium , and  A. aurantium  against  N. aberrans  and chemically characterized nematicidal extracts that may provide alternative sources of botanical nematicides.

Chemical Characterization of Plant Extracts and Evaluation of their Nematicidal and Phytotoxic Potential