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These terms define your current search. Click the × to remove a term. Natural Resources, Earth and Environmental Sciences: ecology > trophic relationships > heterotrophs > parasites > endoparasites > plant parasitic nematodes > cyst nematodes × 75 items, grouped by Taxa - Viruses and Viroids (view ungrouped items) positive sense, single-stranded RNA viruses (1)    (Click to View) Marker-assisted combination of major genes for pathogen resistance in potato Theoretical and applied genetics Pospiviroidae (1)    (Click to View) Organisation of proficiency testing for plant health diagnostic tests: the experience of FAPAS® EPPO bulletin