REPRODUCTION OF GLOBODERA ROSTOCHIENSIS (WOLL.) BEHRENS ON RESISTANT AND SUSCEPTIBLE POTATOES IN FINLAND BY MARJA LEENA MAGNUSSON Swedish University of Agricultural Sciences, Dept. of Plant and Forest Protection, P.O. Box 7044, S-750 07 Uppsala, Sweden Susceptible and resistant (H1) potato cultivars were grown in nematode-infested experimental fields in Northern and Southern Finland. The resistant cultivars yielded well in Southern Finland, and they also satisfactorily reduced the nematode populations. In the northern ex- perimental field at the Arctic Circle the nematode population decreased and seemed to disap- pear, as it also did under susceptible potatoes. Soil temperature and the length of the growing season are not sufficient for the potato cyst nematodes to establish and reproduce in the northern parts of Finland. Further studies on the population biology of potato cyst nematodes in northern regions are needed due to the importance of these areas in the production of seed potatoes. Keywords: life cycle, temperature, potato cyst nematode, resistance genes. The potato cyst nematode, Globodera rostochiensis (Woll.) Behrens, was in- troduced into Finland before or during World War II and first observed in 1946 (Vappula, 1954) with the first noticeable damage on commercial potato farms in the early seventies (Sarakoski,
Nematologica – Brill
Published: Jan 1, 1984
Keywords: resistance genes; potato cyst nematode; temperature; life cycle
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