ABSTRACT
The present study aimed to evaluate the antagonistic effects of jack bean (Canavalia ensiformis) on Meloidogyne enterolobii in tomato plants (Solanum lycopersicum). We studied the effects of aqueous extracts of jack bean seeds at the concentrations of 0, 1, 2, 4 and 8 g/100 mL water on the hatching and mortality of juveniles (J2)in vitro. Under greenhouse conditions, the effect of soil irrigation, plant spraying with aqueous extracts and seed meal incorporation in the soil was evaluated on the rate of galls (IG) and the rate of egg masses (MO) in tomato roots. Results showed that all aqueous extract concentrations were efficient in reducing the hatching and the mortality of M. enterolobii juveniles, when compared to the control; there was also apositive correlation among concentrations. There was a reduction in the number of galls and egg masses both under soil irrigation and under aqueous extract spraying, and the effect was proportional to the extract concentration. The incorporation of seed meals in the soil led to a phytotoxic effect in all treatments, indicating that this is not an appropriate method.
Additional key-words:
Antagonism; Canavalia ensiformis; Nematodes; Solanum lycopersicum
