Effect of bionematicides and nematicides on population density of M. incognita on grape in 2017. All tested products were applied as soil drench. Nematode population densities were estimated 1 and 2 months after nematicide application. Different lowercase within each block indicate significant differences at P ≤ 0.05 according to Tukey’s test (n = 4). Error bars represent standard deviations.