Evaluation of effect of natural plant products against potato cyst nematode Globodera rostochiensis pathotype RO1

Plant parasitic nematodes attack a wide range of crop species. The survival of one quarantine plant parasitic nematode species attacking potatoes, Globodera rostochiensis patotype Ro1 was evaluated in in vitro and pot experiments by tannin aqueous solutions at different concentrations. In the in vitro experiment a different tannin concentration were tested for effect on the egg hatch of the nematode. All the tannin concentrations tested exerted a highly significant reduction of egg viability from 56 to 87% in comparison to the untreated control. In the pot experiment, tannins, as aqueous solutions at rates of 100. 250 and 450 g.m"2, were applied to soil at two different application times (at sowing and at sowing and two weeks later). Ali tested doses were effective to reduce the number of cyst.100 g"' soil, eggs and juveniles.g"1 soil and reproduction rate in comparison to untreated control. The number of eggs and juveniles/cyst was not influenced by the different applied rates of tannins.