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Meloidogyne incognita is highly pathogenic to crops causing severe damage and reduction in yield. During parasitism, nematodes exert detrimental influence on the normal physiology, growth and development of host plant and these conditions have been attributed to the effect of either direct or indirect response of the host to mechanical or biochemical activities of the nematode. Hence the present study has been made to evaluate the efficacy of a bio-nematicide, the leaf extract of goat weed plant, Ageratum conyzoides against the root knot nematode Meloidogyne incognita infecting black gram, Vigna mungo. In the present work, the biochemical characteristics such as total protein, lipid and carbohydrate content present in the leaves of control, inoculated control and the experimental plants treated with different concentrations (2 to 10 ppm) of A. conyzoides after 40 days treatment were analyzed and root gall index were also studied to estimate the nematode population density. Since this extract has a telling effect on the pathogenicity of nematode, it is recommended to be used as a bio-nematicide in the control of root knot nematode in future.
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