Susceptibility of potato cultivars to the potato tuber moth Phthorimaea operculella Zell.
Fifteen potato cultivars were tested for their reaction to P. operculella (potato tuber moth; PTM) using artificial infestation. Plants were scored for PTM leaf damage and, after harvest, tubers were incubated for 10 days at 25-27°C and scored for PTM damage. There was a good correlation between the rate of larval infestation in the leaves and tubers except for cv. Frisia, which had highly susceptible leaves but a low percentage of infested tubers (8.4%). Ailsa, Escort, Blanka, King Edward and Russet Burbank were fairly resistant. Cara, Maris Piper, Desirée and Nicola were moderately resistant and Frisia, Asterix, Spunta, Pentland Squire, Diamant and Alpha were susceptible.