| Abstract: | Summary In recent years, continuing environmental problems associated with the use of nematicides have resulted in a sense of urgency regarding the search for alternative methods of nematode control. Biological control of plant-parasitic nematodes with natural products from plants and animals, and soil organisms are alternative control tactics that are receiving increased interest among nematologists. Natural products include a number of plant parts, by-products, and residues when incorporating into soil, and plant-interculture with other crop plants, crop rotation with non-host or poor host of nematodes, green manuring and other organic manures. Nemato-toxic compounds of the different plants are released through volatilization, exudation, leaching and decomposition. Natural enemies as bio-control agents to nematodes include bacterial and fungal parasites, predatory nematodes and soil invertebrates. The beneficial effects of natural products have been generally considered to be due to direct or indirect stimulation of predators and parasites of nematodes. Very often, when there was a suppression in the nematode population, there was a consequent increase in crop production. |
