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Root-knot nematodes (RKN) (Meloidogyne spp.) are economically the most important pathogens of agricultural products. The aim of the present study was to control Meloidogyne javanica by using Arthrobotrys oligospora and salicylic acid (SA) and to analyse the kinetics of enzymes, phenylalanine ammonia lyase (PAL), peroxidase (POX), polyphenol oxidase (PPO) and phenolic compounds accumulation in the root system of tomato after inoculation with M. javanica, A. oligospora and SA. The ability of A. oligospora to produce extracellular proteases was also examined. In greenhouse studies, we used soil drenching of A. oligospora (106 spores/ml) and soil drenching or leaf spraying of SA (5 mM) in six-leaf stage, separately and in combination. Experiments were performed in a completely randomised design. The efficiencies of treatments were appraised by using diameter of galls, number of galls per plant, number of egg masses per plant, number of eggs per egg mass, root and foliage fresh weight. The results showed that ...