Effect of bioactive compound from luminescent mushroom (Neonothopanus nambi Speg.) on root-knot nematode (Meloidogyne incognita Chitwood) and non-target organisms

Abstract

The objective of this study was to investigate the effect of bioactive compounds from a luminescent mushroom (Neonothopanus nambi) on root-knot nematode (Meloidogyne incog- nita) and non-target organisms, entomopathogenic nematode (EPN), Steinernema carpo- capsae; plant pathogenic fungi, Pythium sp. and Phytophthora palmivora; composting fungus, Aspergillus sp.; biocontrol agents, Trichoderma harzianum.; Bacillus subtilis and nitrogen fixing bacteria, Rhizobium sp. under laboratory conditions. Five concentrations of the bioactive compounds, 0, 10, 50, 100 and 500 mg/l, were exposed to the tested organisms. Mortality percentage of nematodes (M. incognita and S. carpocapsae) and inhibition zone around paper disk soaked with bioactive compound suspensions were recorded. The results revealed that concentrations of 10, 50, 100 and 500 mg/l were highly toxic to M. incognita causing 100 % mortality, but had no adverse effect on S. carpocapsae, Aspergillus sp., Trichoderma harzianum; Bacillus subtilis and Rhizobium sp. Inhibition zone was detected on colonies of Pythium sp. and P. palmivora, but only on the medium with bioactive compound concentration of 500 mg/l. The results suggest the potential use of bioactive compounds from N. nambi for control of plant parasitic nematode, M. incognita without adverse effects on beneficial organisms.