Inhabitory effects of different organs of weeds such as Chenopodium album, Amaranthus retroflexus and convolvulus arvensis on mortality of root-knot Nematode, Meloidogyne javanica under Laboratory and greenhouse conditions.

Root-knot nematodes (Meloidogyne spp.) are the most important plant pathogenic nematodes that reduce yield of economic plants worldwide. The use of compounds of plant secondary metabolites has been proposed as the best alternative strategy for controlling nematodes due to its properties such as specific mechanism of action, limited spectrum of action and the ability to decompose into non-toxic metabolites. This study was performed to investigate the inhibitory effect of aqueous extracts of Chenopodium album, Amaranthus retroflexus and convolvulus arvensis on mortality of root-knot Nematode, (Meloidogyne javanica) in vitro conditions. Experiment in a completely randomized design with 3 factors (1- type of extract in 3 levels of Ch. album, A. retroflexus and C. arvensis, 2- concentration of extract in 3 levels with ratios of 0.04, 0.2 and 0.4% and 3- Extraction organs were performed at 3 levels of leaves, stems and roots in 3 replications for each treatment in laboratory conditions and the two plants that had the most effect were done in Labratory conditions. The results showed that the extracts of all three plants significantly increased the mortality of second level of nematode larvae. The extract of 0.4% of coriander leaves with 98.3% mortality of age 2 larvae had the highest mortality and the extract of 0.2% and 0.04% of ivy root with 37% had the lowest mortality. The two plants of Ch. album and A. retroflexus, which had the best results in vitro, were studied in greenhouse conditions. The reproductive factor of control with nematode has a significant difference with other treatmentsFrom the results of study,it can be cincluded that it is possible that the weeds of tomato fields especially A.retroflexus and Carvensi,returning to the ground canreduce the J2population of root-knit nematodes in the soil.