Nematicidal efficacy of isothiocyanates against root-knot nematode Meloidogyne javanica in cucumber
2011
Wu, Hua | Wang, Chao-Jun | Bian, Xiao-Wei | Zeng, Shui-Yun | Lin, Kai-Chun | Wu, Bo | Zhang, Guo'an | Zhang, Xing
Isothiocyanates (ITCs), a series of new nematicides of the –NCS group, were evaluated for their efficacy against root-knot nematode Meloidogyne javanica. Of the compounds tested, AllylITC, AcITC, EtITC, BzTC, BzITC, 1-PEITC and 2-PEITC showed in vitro irreversible nematicidal activity against second-stage juveniles of M. javanica, following exposure for 72 h at concentrations as low as 5 μg mL⁻¹. When exposed to AllylITC, AcITC and EtITC at lower concentrations, motile juveniles also became irreversibly immobile in 3 days, with a LC₅₀ value at 2.76, 2.53 and 3.05 μg mL⁻¹, respectively. In the pot experiments, 1.0 ml AllylITC and 1.1 ml AcITC per kg of soil controlled M. javanica, similarly to or better than metam sodium at its recommended dose. Similar results were obtained in the field experiments using 1.0 kg AllylITC or 1.0 kg AcITC ha⁻¹. Based on the results of this study, AllylITC and AcITC have potential to be used as new bio-fumigant nematicides.
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