ABSTRACT
Distribution Because the potato cyst nematodes are parasitic on both tubers and roots and are able to survive adverse environmental conditions, the distribution of these nematodes is nearly equal to the distribution of the crop. G. pallida and G. rostochiensis originated in the Andes of South America with the potato. These important pests have been reported from 58 countries, representing all continents, in temperate zones and at high altitude in the tropics. Both species are widely distributed in northern Europe, but
G .
