Abstract
Invasion by and emergence of second stage juveniles of Globodera rostochiensis (Ro1) and G. pallida (Pa2/3) from the roots of cvs. Pentland Crown (susceptible) and Maris Piper (resistant to Ro1) were studied. In pots with cysts of G. rostochiensis the ratio of second stage juveniles in the soil to the numbers of all stages in the roots was always greater with Maris Piper than with Pentland Crown. Using hatched juveniles the initial invasion rates were similar for both species and both cultivars. However, some second stage juveniles that had invaded subsequently emerged from the roots. The numbers of these emerging juveniles were much greater for the resistant combination of Maris Piper with G. rostochiensis than for the susceptible combinations of Pentland Crown with G. rostochiensis and Maris Piper and Pentland Crown with G. pallida. Fewer G. rostochiensis developed as adult males and females on Maris Piper than on Pentland Crown.
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