The efficacy of dry olive (Olea europaea) pomace as a soil amendment for control of root-knot nematodes was studied in a greenhouse experiment with 'Rutgers' tomato (Lycopersicon esculentum) on a sandy soil naturally infested with Meloidogyne arenaria. Olive pomace (OP) was added to the soil at rates of 0, 2, 4, 6, 10, 16, and 20 g/kg soil. OP was applied alone or in combination with 0.1 and 0.2 g urea/kg soil. Twelve days after addition of the amendments, tomato seedlings were transplanted to pots containing treated soil and were allowed to grow for 45 days. OP without urea was toxic to the seedlings and had no effect on root galling caused by M. arenaria. The OP + urea treatments resulted in increased size and weight of the seedlings. OP at 4-6 g/kg soil in combination with the 0.2 g rate of urea suppressed root galling and resulted in the heaviest and healthiest looking seedlings. In other studies, the nematicidal activity of OP distillates was assessed in the laboratory and green
