| management of cereal cyst nematodes, heterodera spp., in norway. | cereal cyst nematodes, heterodera spp., are known worldwide as parasites of cereals and grasses. surveys of cereal fields in norway have revealed that nematodes belonging to the h. avenae complex occur throughout the country, and that h. avenae (the oat cyst nematode) is the most common species, followed by h. filipjevi (the rye cyst nematode). both species are of economic importance in scandinavia. h. avenae has been found in two common pathotypes, ha 11 and ha 12. work in sweden, however, has ... | 2006 | 17390804 |