A comparison between the changes in oxidants and antioxidants (involved in defense mechanisms in plants against pathogens) in cowpea, eggplant, jasmine, papaya and sour orange in response to infection with Meloidogyne incognita, Rotylenchulus reniformis and Tylenchulus semipenetrans was held. Different hosts react the same way to nematode infection, whereas oxidants, lipid peroxidase (MDA) and hydrogen peroxide (H 2 O 2 ) were increased after nematode infection. Also antioxidant substances, Glutathione (GSH) and ascorbic acid (AA) as well as enzymes, superoxide dismutase (SOD), Catalase (CAT) ,ascorbate peroxidase (APX) and glutathione-S-transferase (GST) were also increased. The rates of increase differed according to nematode species, host plant and nematode initial population.

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