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These terms define your current search. Click the × to remove a term. Biological Sciences: biological properties and phenomena > vigor × 358 items, grouped by Taxa - Viruses and Viroids (view ungrouped items) DNA viruses (1)    (Click to View) Inheritance of Tomato yellow leaf curl virus Resistance Derived from Solanum pimpinellifolium UPV16991 Plant disease Pospiviroidae (1)    (Click to View) Occurrence of Viroids in Commercial Hop (Humulus lupulus L.) Production Areas of Washington State Plant health progress