Abstract
About 10000 soil samples, 519 thereof infected with potato cyst nematode (PCN), were studied during 1984-1988. Cysts from infected samples were tested by isoelectric focusing to identify PCN species. All the infected samples were also tested with H1-resistant (Satuma) and susceptible (Bintje) potato cultivars to separate resistance breaking populations. Cysts from the roots of Satuma were tested by two-dimensional electrophoresis. The potato seed production area in Finland was found to be free of PCN of any kind. In other parts of Finland all tested samples revealed G. rostochiensis banding pattern, but no G. pallida was found. Except for the most common pathotype Ro1-Ro4, we only found Ro2.
Highlights
In Finland, potatoes are grown commercially on about 41 000 hectares
The cultivated area extends from the southern coast (60° 00’N) up to the north (69° 00’N)
Magnusson (1987) and Tiilikkala (1987, 1991) have studied the biological and physical factors affecting the success of G. rostochiensis
Summary
In Finland, potatoes are grown commercially on about 41 000 hectares. The cultivated area extends from the southern coast (60° 00’N) up to the north (69° 00’N). The growing season for potatoes extends from mid-May to the end of August in southern Finland. In the north the growing season is more than one month shorter (Mukula and Rantanen 1987). Potato cyst nematode (PCN), Globodera rostochiensis, was found in Finland for the first time in 1946 (Vappula 1954), and the first noticeable damage on commercial potato farms appeared in s the early 1970 (Sarakoski 1976a). Since the beginning of the 19705,PCN has been the most harmful pest ofpotatoes in Finland. Magnusson (1987) and Tiilikkala (1987, 1991) have studied the biological and physical factors affecting the success of G. rostochiensis.
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