Abstract:

【Objective】 Root-knot nematode (Meloidogyne spp.) is one of the major pathogens of crop diseases. Effective control of root-knot nematode diseases requires development of products that are effective, economical and environmentally safe. This study investigated the nematicidal activity of pyroligneous liquor on J2 of Meloidogyne spp. and the effectiveness of pyroligneous and its powder in controlling root-knot nematode diseases. 【Method】 Nematicidal activity of pyroligneous for J2 of Meloidogyne spp. with dipping method was determined at various dilution ratios. Results of the laboratory study were used in the design of treatments in green house and field trials. 【Result】 The pyroligneous liquor at various dilution ratios had nematicidal activity on the J2 of 4 common Meloidogyne spp.. Nematicidal activity of pyroligenous liquor decreased as dilution ratio increased. Mortalities of J2 of four common root-knot nematodes, Meloidogyne hapla, M. arenaria, M. incognita and M. javanica were 76.3%, 78.4%, 77.9% and 72.2%, respectively, at 72 hours after treatment with pyroligneous solution at 1:150 dilution ratio. Results from field studies indicated that pyrogenenous liquor and its powder were effective at controlling megranate root-knot nematode disease, with efficiencies of 63.9% and 50.5%, respectively. Pyroligneous liquor and its powder also had control efficiency on tomato root-knot nematode disease, in Xundian County were 54.1% and 28.6% respectively,and in Gejiu were 27.8% and 19.6%, respectively.【Conclusion】 These results show that pyroligneous liquor has nematicidal activity on J2 of Meloidogyne spp. and control efficiency on megranate and tomato root-knot nematode diseases. The pyroligneous liquor is a kind of effective resource with exploitative prospect and potential application value in the field of root-knot nematode diseases control.

Key words: pyroligneous, Meloidogyne spp., nematicidal activity, root-knot nematode disease, field efficacy trials