In-vitro and in-vivo mortality of root knot nematode on black gram, (Vigna mungo L.) using different fungal filtrates

An experiment was conducted to evaluate the effect of culture filtrates of selected soil fungi (Aspergillus flavus Aspergillus niger, A.fumigatus, Fusarium oxysporum, Penicillium vermiculatum and Rhizopus nigricans) on the mortality and hatching of root knot nematode, Meloidogyne incognita infesting black gram, Vigna mungo L under in- vitro and in- vivo conditions. It was observed from the study that all the test fungal filtrates showed different response to both hatching and mortality of Meloidogyne incognita. Hatching of eggs by higher concentrations of cultural filtrates was significantly decreased in comparison to control. The culture filtrate of Aspergillus niger showed significantly higher toxicity to over other test fungi. The development and reproduction of root-knot nematode was also significantly reduced and adversely affected in all treated seedlings of black gram. Application as soil drench with culture filtrates resulted in better plant growth and caused significant reduction nematode reproduction factor in comparison to plants raised from seeds soaked in cultural filtrates of the test fungi.