Management of Plant Parasitic Nematodes By The Use of Botanicals

Eight plant species namely Solanum surattense, Theviatia peruviana, Calotropis procera, Thuja sinesis, Parthenium husterophorus, Croton sparsiflorus, Colocasia antiguorum and Datura stramonium were evaluated for the nematicidal properties against J₂ of Meloidogyne incognita and pre-adults of Rotylenchulus reniformis in vitro. One hundred % mortality of both the nematode species were found in 8/16 dilution except S. surattense fruits (unripened) whereas in 8/32, the range was 50–100% in case of M. incognita and 51–86% in case of R. reniformis. The recovery of the juveniles and pre-adults were very low or nil after exposure to higher dilutions than lower ones. When plants extracts (S/16 and 8/32 dilutions) were put around mung crop in pots, resulted an increase in shoot length, maximum being in Colocasia antiguorum leaves extract similarly, a significant increase of shoot and root weights were also observed. However, maximum reduction of galls was noticed in Calotropis procera followed by Datura stramonium and Solanum surattense leaves extracts.