Commercial Formulates of Induce Systemic Plant Resistance to in Tomato and the Effect Is Additive to That of the Resistance Gene.

is the most damaging plant parasitic nematode genus affecting vegetable crops worldwide. The induction of plant defense mechanisms against in tomato by some spp. strains has been proven in pot experiments, but there is no information for tomato bearing the resistance gene or for other important fruiting vegetable crops. Moreover, is mostly applied for managing fungal plant pathogens, but there is little information on its effect on nematode-antagonistic fungi naturally occurring in soils. Thus, several experiments were conducted to determine (i) the ability of two commercial formulates of (T34) and (T22) to induce systemic resistance in tomato and cucumber against an avirulent population in split-root experiments; (ii) the effect of combining T34 with tomato carrying the resistance gene to an avirulent population in sterilized soil; and (iii) the effect of combining T34 with tomato carrying the resistance gene to a virulent population in two suppressive soils in which is naturally present, and the effect of T34 on the level of egg parasitism. Both formulates induced resistance to in tomato but not in cucumber. In tomato, the number of egg masses and eggs per plant were reduced by 71 and 54% by T34, respectively. T22 reduced 48% of the number of eggs per plant but not the number of egg masses. T34 reduced the number of eggs per plant of the virulent population in both resistant and susceptible tomato cultivars irrespective of the suppressive soil, and its effect was additive with the resistance gene. The percentage of fungal egg parasitism by was not affected by the isolate T34 of .