The effect of oxamyl and the growing of susceptible and resistant potato cultivars on the population dynamics of Globodera rostochiensis throughout the soil profile

Comparisons are made between the population dynamics of potato cyst nematode and root growth of Pentland Crown and Maris Piper potato cultivars. Large changes in the number of eggs occurred to a depth of 48 cm, particularly in a peaty loam and in plots treated with oxamyl. Oxamyl delayed the hatch of eggs in the peaty loam but not in the sandy loam, giving the protected plants several weeks without invasion damage during which they became bigger with their roots better established deeper in the soil. Oxamyl killed or impaired the movement of second stage juveniles but appeared to have little systemic activity to hinder juvenile development within roots.